Q JEE Mains 2026

5.33 g of $\mathrm{CrCl}_3 \cdot 6 \mathrm{H}_2 \mathrm{O}$, which is a $1: 3$ electrolyte, is dissolved in water and is...

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Q JEE Main 2026

Match List - I with List - II. List - I List - II

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Q JEE MAIN 2026

X is the number of geometrical isomers exhibited by $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{BrCl}\right]$. Y is the number of optically inactive isomer(s)...

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Q JEE MAIN 2026

The correct statement among the following is:

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Q JEE MAIN_2026

The number of isoelectronic species among $\mathrm{Sc}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}, \mathrm{Co}^{3+}$ and $\mathrm{Fe}^{3+}$ is ' $n^{\prime}$. If ' $n$ ' moles...

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Q JEE MAIN 2026

The wavelength of light absorbed for the following complexes are in the order

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Q JEE MAIN_2026_

The correct increasing order of spin-only magnetic moment values of the complex ions $\left[\mathrm{MnBr}_4\right]^{2-}(\mathrm{A}),\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}(\mathrm{B}),\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}(\mathrm{C})$ and $\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}(\mathrm{D})$ is :

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Q JEE MAIN 2026

A hydroxy compound $(\mathrm{X})$ with molar mass $122 \mathrm{~g} \mathrm{~mol}^{-1}$ is acetylated with acetic anhydride, using a large excess of...

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Q JEE MAIN 2026

Given below are two statements: Statement I: The number of paramagnetic species among $\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{TiF}_6\right]^{3-}, \mathrm{V}_2 \mathrm{O}_5$ and $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ is 3...

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Q JEE MAIN 2026

Consider a mixture ' X ' which is made by dissolving 0.4 mol of $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}$ and 0.4 mol...

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Q JEE MAIN 2026

Total number of unpaired electrons present in the central metal atoms/ions of $\left[\mathrm{Ni}(\mathrm{CO})_4\right],\left[\mathrm{NiCl}_4\right]^{2-},\left[\mathrm{PtCl}_2\left(\mathrm{NH}_3\right)_2\right],\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ and $\left[\mathrm{Pt}(\mathrm{CN})_4\right]^{2-}$ is $\_\_\_\_$ .

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Q JEE MAIN 2026

Given below are two statements: Statement I: Hybridisation, shape and spin only magnetic moment of $\mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{CO}_3\right)_3\right]$ is $\mathrm{sp}^3 \mathrm{~d}^2$, octahedral...

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Q JEE MAIN 2026

The crystal field splitting energy of $\left[\mathrm{Co}(\text { oxalate })_3\right]^{3-}$ complex is ' $n$ ' times that of the $...

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Q JEE MAIN 2026

Identify the CORRECT set of details from the following : A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ : Inner orbital complex ; d $...

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Q JEE MAIN 2026

The statements that are incorrect about the nickel(II) complex of dimethylglyoxime are : A. It is red in colour. B....

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Q JEE MAIN 2026

Given below are two statements: Statement I: Crystal Field Stabilization Energy $(\mathrm{CFSE})$ of $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ is greater than that of...

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Q JEE MAIN 2026

$\left[\mathrm{Ni}\left(\mathrm{PPh}_3\right)_2 \mathrm{Cl}_2\right]$ is a paramagnetic complex. Identify the INCORRECT statements about this complex. A. The complex exhibits geometrical isomerism. B....

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Q JEE MAIN 2026

Consider the transition metal ions $\mathrm{Mn}^{3+}, \mathrm{Cr}^{3+}, \mathrm{Fe}^{3+}$ and $\mathrm{Co}^{3+}$ and all form low spin octahedral complexes. The correct decreasing...

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Q JEE MAIN_2026

Given below are two statements: Statement I: Among $\left.\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+},\left[\mathrm{Ni}(\mathrm{en})_3\right)\right]^{2+},\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}$ and $\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$, $\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ has the maximum number of unpaired...

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Q JEE MAIN_2026_

Given below are two statements : Statement I : The number of species among $\mathrm{SF}_4, \mathrm{NH}_4^{+},\left[\mathrm{NiCl}_4\right]^{2-}, \mathrm{XeF}_4,\left[\mathrm{PiCl}_4\right]^{2-}, \mathrm{SeF}_4$ and $\left.[\mathrm{NiCN})_4\right]^{2-}$,...

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Q JEE MAIN 2019

The degenerate orbitals of $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ are

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Q JEE MAIN 2019

The complex that has highest crystal field splitting energy (Δ), is

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Q JEE MAIN 2019

Homoleptic octahedral complexes of a metal ion ' $\mathrm{M}^{3+1}$ with three monodentate ligands $\mathrm{L}_1, \mathrm{~L}_2$ and $\mathrm{L}_3$ absorb wavelengths in...

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Q JEE MAIN_2019_

Three complexes, $\quad\left[\mathrm{CaCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}(\mathrm{I})$, $\left[\mathrm{Ca}\left(\mathrm{NH}_3\right)_5 \mathrm{H}_2 \mathrm{O}\right]^{3+}(\mathrm{II})$ and $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ (III) absorb light in the visible region. The correct order of the...

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Q JEE MAIN 2020

The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are $x, y$ and $z$. The sum...

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Q JEE MAIN 2019

Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following...

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Q JEE MAIN 2020

Consider that a $\mathrm{d}^6$ metal ion $\left(\mathrm{M}^{2+}\right)$ forms a complex with aqua ligands, and the spin only magnetic moment of...

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Q JEE MAIN 2020

For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements: (I) both the complexes can be high spin. (II)...

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Q JEE MAIN 2020

The one that is not expected to show isomerism is

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Q JEE MAIN 2019

The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is:

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Q JEE MAIN 2020

Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of $\mathrm{M}^{n^{+}}$ion are provided below; their $\lambda_{\max }$ values are...

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Q JEE MAIN 2019

The coordination numbers of Co and Al in $\left[\mathrm{Co}(\mathrm{Cl})(\mathrm{en})_2\right] \mathrm{Cl}$ and $\mathrm{K}_3\left[\mathrm{Al}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]$, respectively, are (en $=$ ethane -1 ,...

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Q JEE MAIN 2019

The complex that has highest crystal field splitting energy ( $\Delta$ ), is

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Q JEE MAIN_2019_

The species that can have a trans-isomer is : (en = ethane-1, 2-diamine, ox = oxalate)

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Q JEE-MAIN 2019

In the following reaction

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Q JEE-MAIN 2019

The metal d-orbitals that are directly facing the ligands in $\mathrm{K}_3\left[\mathrm{Co}(\mathrm{CN})_6\right]$ are

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Q JEE MAIN 2019

The one that will show optical activity is (en = ethane-1,2-diamine)

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Q JEE MAIN 2020

The total number of coordination sites in ethylenediaminetetraacetate (EDTA ${ }^{4-}$ ) is

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Q JEE MAIN 2020

The values of the crystal field stabilization energies for a high spin $d^6$ metal ion in octahedral and tetrahedral fields,...

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Q JEE MAIN 2019

The magnetic moment of an octahedral homoleptic Mn(II) complex is 5.9 BM. The suitable ligand for this complex is

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Q JEE MAIN 2020

For a $\mathrm{d}^4$ metal ion in an octahedral field, the correct electronic configuration is

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Q JEE MAIN 2020

The species that has a spin-only magnetic moment of 5.9 BM , is ( $T_{\mathrm{d}}=$ tetrahedral)

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Q JEE MAIN 2020

Complex $X$ of composition $\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6 \mathrm{Cl}_n$ has a spin only magnetic moment of 3.83 BM . It reacts with...

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Q JEE MAIN 2020

$[\mathrm{Pd}(\mathrm{F})(\mathrm{Cl})(\mathrm{Br})(\mathrm{I})]^{2-}$ has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of $...

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Q JEE MAIN 2020

The volume (in mL ) of $0.125 \mathrm{M} \mathrm{AgNO}_3$ required to quantitatively precipitate chloride ions in 0.3 g of $...

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Q JEE-MAIN 2020

Considering that $\Delta_0>\mathrm{P}$, the magnetic moment (in BM) of $\left[\mathrm{Ru}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ would be $\_\_\_\_$ .

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Q JEE-MAIN 2020

Consider the complex ions, trans- $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]_{\sim}^{+}(\mathrm{A})$ and cis- $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]_{\sim}^{+}(\mathrm{B})$. The correct statement regarding them is

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Q JEE MAIN 2020

The complex that can show fac-and mer-isomers is

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Q JEE MAIN 2019

The crystal field stabilization energy (CFSE) of $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_2$ and $\mathrm{K}_2\left[\mathrm{NiCl}_4\right]$, respectively, are :

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Q JEE MAIN 2019

The INCORRECT statement is :

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Q JEE MAIN 2020

The pair in which both the species have the same magnetic moment (spin only) is

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Q JEE Main 2019

Wilkinson catalyst is $\left(\mathrm{Et}=\mathrm{C}_2 \mathrm{H}_5\right)$

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Q JEE MAIN 2020

The molecule in which hybrid MOs involve only one d-orbital of the central atom is

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Q JEE MAIN 2020

The isomer(s) of $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]$ that has/have a $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ angle of $90^{\circ}$, is/are

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Q JEE MAIN 2019

The coordination number of Th in $\mathrm{K}_4\left[\mathrm{Th}\left(\mathrm{C}_2 \mathrm{O}_4\right)_4\left(\mathrm{OH}_2\right)_2\right]$ is $\left(\mathrm{C}_2 \mathrm{O}_4^{2-}=\right.$ Oxalato $)$

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Q JEE MAIN 2020

The correct order of the spin-only magnetic moments of the following complexes is : (I) $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Br}_2$ (II) $\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$...

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Q JEE MAIN 2020

The Crystal Field Stabilization Energy $(\mathrm{CFSE})$ of $\left[\mathrm{CoF}_3\left(\mathrm{H}_2 \mathrm{O}\right)_3\right]\left(\Delta_0

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Q JEE MAIN 2020

The one that can exhibit highest paramagnetic behaviour among the following is gly = glycinato; bpy = 2, 2'-bipyridine

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Q JEE MAIN 2019

The number of bridging CO ligand(s) and Co -Co bond(s) in $\mathrm{Co}_2(\mathrm{CO})_8$, respectively are:

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Q JEE MAIN 2020

Among (a) - (d), the complexes that can display geometrical isomerism are (a) $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}\right]^{+}$ (b) $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right) \mathrm{Cl}_5\right]^{-}$ (c) $...

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Q JEE-MAIN 2020

Complex A has a composition of $\mathrm{H}_{12} \mathrm{O}_6 \mathrm{Cl}_3 \mathrm{Cr}$. If the complex on treatment with conc. $\mathrm{H}_2 \mathrm{SO}_4$ loses...

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Q JEE-MAIN 2020

The d-electron configuration of $\left[\mathrm{Ru}(\mathrm{en})_3\right] \mathrm{Cl}_2$ and $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_2$ , respectively are

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Q JEE MAIN 2020

The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is (A) $\mathrm{Ni}(\mathrm{CO})_4$ (B) $...

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Q JEE MAIN 2020

The theory that can completely/properly explain the nature of bonding in $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ is :

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Q JEE MAIN 2020

The IUPAC name of the complex $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2\right. \left.\mathrm{Cl}\left(\mathrm{NH}_2 \mathrm{CH}_3\right)\right] \mathrm{Cl}$ is :

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Q JEE MAIN 2021

The number of optical isomers possible for $\left[\mathrm{Cr}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ is

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Q JEE-MAIN 2021

The overall stability constant of the complex ion $\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$ is $2.1 \times 10^{13}$. The overall dissociations constant is $...

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Q JEE MAIN 2021

A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing...

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Q JEE MAIN 2021

$$ \text { Spin only magnetic moment in } \mathrm{BM} \text { of }\left[\mathrm{Fe}(\mathrm{CO})_4\left(\mathrm{C}_2 \mathrm{O}_4\right)\right]^{+} \text {is : } $$

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Q JEE MAIN 2021

Which one of the following methods is most suitable for preparing deionized water?

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Q JEE MAIN 2019

A reaction of cobalt (III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products A...

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Q JEE MAIN_2021

3 moles of metal complex with formula $\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_3$ gives 3 moles of silver chloride on treatment with excess of...

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Q JEE MAIN 2021

Which one of the following complexes is violet in colour?

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Q JEE MAIN 2021

1 mol of an octahedral metal complex with formula $\mathrm{MCl}_3 \cdot 2 \mathrm{~L}$ on reaction with excess of $\mathrm{AgNO}_3$ gives...

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Q JEE-MAIN 2021

Indicate the complex/complex ion which did not show any geometrical isomerism :

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Q JEE-MAIN 2021

The sum of oxidation states of two silver ions in $\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]\left[\mathrm{Ag}(\mathrm{CN})_2\right]$ complex is _______.

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Q JEE-MAIN 2021

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

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Q JEE MAIN 2021

The potassium ferrocyanide solution gives a Prussian blue colour, when added to

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Q JEE-MAIN 2021

The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion (...

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Q JEE MAIN 2021

The denticity of an organic ligand, biuret is :

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Q JEE MAIN 2021

The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion $\left(\mathrm{M}^{\mathrm{z}^{+}}\right)$are...

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Q JEE MAIN 2019

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Q JEE MAIN 2021

The spin-only magnetic moment value for the complex $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{4-}$ is $\_\_\_\_$ BM. [At. no. of $\mathrm{Co}=27$ ]

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Q JEE MAIN 2019

The correct order of the spin-only magnetic moment of metal ions in the following low-spin complexes, $\left[\mathrm{V}(\mathrm{CN})_6\right]^{4-},\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-},\left[\mathrm{Ru}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ and $\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]^{2+}$, is:

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Q JEE MAIN 2021

The total number of unpaired electrons present in $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_2$ and $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$ is

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Q JEE MAIN 2021

Which one of the following metal complexes is most stable?

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Q JEE MAIN 2021

The correct order of intensity of colors of the compounds is :

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Q JEE MAIN 2021

According to the valence bond theory the hybridization of central metal atom is $\mathrm{dsp}^2$ for which one of the following...

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Q JEE MAIN 2021

Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula $...

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Q JEE MAIN 2021

An aqueous solution of $\mathrm{NiCl}_2$ was heated with excess sodium cyanide in presence of strong oxidizing agent to form $\left[\mathrm{Ni}(\mathrm{CN})_6\right]^{2-}$....

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Q JEE MAIN 2021

Which one of the following species responds to an external magnetic field?

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Q JEE MAIN 2021

Spin only magnetic moment of an octahedral complex of $\mathrm{Fe}^{2+}$ in the presence of a strong field ligand in BM...

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Q JEE MAIN 2021

The number of geometrical isomers possible in triamminetrinitrocobalt (III) is X and in trioxalatochromate (III) is Y. Then the value...

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Q JEE MAIN 2021

The number of geometrical isomers found in the metal complexes $\left[\mathrm{PtCl}_2\left(\mathrm{NH}_3\right)_2\right],\left[\mathrm{Ni}(\mathrm{CO})_4\right],\left[\mathrm{Ru}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{Cl}_3\right]$ and $\left[\mathrm{CoCl}_2\left(\mathrm{NH}_3\right)_4\right]^{+}$respectively, are :

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Q JEE MAIN 2021

The type of hybridisation and magnetic property of the complex $\left[\mathrm{MnCl}_6\right]^{3-}$, respectively, are :

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Q JEE MAIN 2019

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]_2$ and $\left[\mathrm{Fe}(\mathrm{CN})_6\right]$, respectively, are:

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Q JEE MAIN 2019

The compound that inhibits the growth of tumors is

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Q JEE MAIN 2021

Copper reduces $\mathrm{NO}_3^{-}$into NO and $\mathrm{NO}_2$ depending upon the concentration of $\mathrm{HNO}_3$ in solution. (Assuming fixed $\left[\mathrm{Cu}^{2+}\right]$ and $\mathrm{P}_{\mathrm{NO}}=\mathrm{P}_{\mathrm{NO} 2}$...

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Q JEE-MAIN 2021

Match List-I with List-II :

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Q JEE MAIN 2021

The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is _______ BM.

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Q JEE MAIN 2021

$\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ absorbs light of wavelength 498 nm during a $\mathrm{d}-\mathrm{d}$ transition. The octahedral splitting energy for the avove complex...

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Q JEE Main 2019

The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is

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Q JEE Main 2019

Two complexes $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3(\mathrm{~A})$ and $\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]_3(\mathrm{~B})$ are violet and yellow coloured, respectively. The incorrect statement regarding them is

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Q JEE MAIN 2021

The total number of unpaired electrons present in the complex $\mathrm{K}_3\left[\mathrm{Cr}(\text { oxalate })_3\right]$ is $\_\_\_\_$ .

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Q JEE MAIN 2021

The correct structures of trans- $\left[\mathrm{NiBr}_2\left(\mathrm{PPh}_3\right)_2\right]$ and meridonial- $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{NO}_2\right)_3\right]$, respectively, are

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Q JEE MAIN 2021

Match List-I with List-II Choose the most appropriate answer from the options given below :

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Q JEE MAIN 2021

Given below are two statements : Statement 1 : The identification of $\mathrm{Ni}^{2+}$ is carried out by dimethyl glyoxime in...

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Q JEE AMIN 2021

In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only...

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Q JEE MAIN 2021

The number of stereoisomers possible for $\left[\mathrm{Co}(\mathrm{ox})_2(\mathrm{Br})\left(\mathrm{NH}_3\right)\right]^{2-}$ is $\_\_\_\_$ [ox = oxalate]

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Q JEE MAIN 2021

Number of bridging CO ligands in $\left[\mathrm{Mn}_2(\mathrm{CO})_{10}\right]$ is $\_\_\_\_$ .

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Q JEE MAIN 2021

The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of $...

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Q JEE MAIN 2021

The hybridization and magnetic nature of $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{4-}$ and $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$, respectively are:

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Q JEE MAIN 2022

The metal complex that is diamagnetic is (Atomic number : Fe, 26; Cu, 29)

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Q JEE MAIN 2022

Sum of oxidation state (magnitude) and coordination number of cobalt in $\mathrm{Na}\left[\mathrm{Co}(\mathrm{bpy}) \mathrm{Cl}_4\right]$ is $\_\_\_\_$ .

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Q JEE MAIN 2022

Total number of relatively more stable isomer(s) possible for octahedral complex $\left[\mathrm{Cu}(\mathrm{en})_2(\mathrm{SCN})_2\right]$ will be $\_\_\_\_$ .

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Q JEE MAIN 2022

$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this...

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Q JEE-Main

Consider the following metal complexes : $$ \begin{aligned} & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)\right]^{3+}} \\ & {\left[\mathrm{CoCl}(\mathrm{NH} 3)_5\right]^{2-1}} \\ & {\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}} \\ & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2...

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Q JEE MAIN 2022

The spin only magnetic moment of the complex present in Fehling's reagent is_______ B.M. (Nearest integer).

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Q JEE MAIN 2022

The correct order of energy of absorption for the following metal complexes is

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Q JEE MAIN 2022

The metal complex that is diamagnetic is (Atomic number : Fe, 26; Cu, 29)

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Q JEE MAIN 2022

$\mathrm{Fe}^{3+}$ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:

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Q JEE MAIN 2022

The difference between spin only magnetic moment values of $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_3\right]_{\mathrm{Cl}}$ and $\left[\mathrm{Cr}_2\left(\mathrm{H}_2 \mathrm{O}\right)_3\right]_{\mathrm{l}} \mathrm{Cl}_3$ is $\_\_\_\_$ .

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Q JEE MAIN 2022

Low oxidation state of metals in their complexes are common when ligands:

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Q JEE MAIN 2022

Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the...

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Q JEE MAIN 2022

In following pairs, the one in which both transition metal ions are colourless is :

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Q JEE-MAIN 2022

Match List I with List II

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Q JEE MAIN 2022

For the reaction given below: $$ \mathrm{CoCl}_{3 m} \times \mathrm{NH}_3+\mathrm{AgNO}_3(\mathrm{ag}) \rightarrow $$ If two equivalents of AgCl precipitate out, then...

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Q JEE MAIN 2022

Spin only magnetic moment of $[\mathrm{MnBr} \mathbf{r}]^{4-}$ is $\_\_\_\_$ B.M. (round off to the closest integer)

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Q JEE MAIN 2022

(a) $\mathrm{CoCl}_3 \cdot 4 \mathrm{NH}_3$ (b) $\mathrm{CoCl}_3 \cdot 5 \mathrm{NH}_3$ (c) $\mathrm{CoCl}_3 \cdot .6 \mathrm{NH}_3$ and (d) $...

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Q JEE MAIN 2022

Reaction of $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of...

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Q JEE MAIN 2022

Given below are two statements . Statement I: In $\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}, \mathrm{Cu}-\mathrm{O}$ bonds are present. Statement II:...

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Q JEE MAIN 2022

Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: Mn = 25; Fe = 26)

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Q JEE MAIN 2022

Amongst $\mathrm{FeCl}_3 .3 \mathrm{H}_2 \mathrm{O}, \mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ and $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$, the spin-only magnetic moment value of the inner-orbital complex that absorbs...

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Q JEE-Main 2022

Transition metal complex with highest value of crystal field splitting ( $\Delta_0$ ) will be

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Q JEE MAIN 2022

Number of complexes which will exhibit synergic bonding amongst, $\left[\mathrm{Cr}(\mathrm{CO})_6\right],\left[\mathrm{Mn}(\mathrm{CO})_5\right]$ and $\left[\mathrm{Mn}_2(\mathrm{CO})_{10}\right]$ is $\_\_\_\_$ .

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Q JEE-Main 2022

In the cobalt-carbonyl complex: $\left[\mathrm{Co}_2(\mathrm{CO})_4\right]$, number of Co -Co bonds is " X " and terminal CO ligands is "...

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Q JEE MAIN 2022

The number of statement(s) correct from the following for copper (at no. 29) is/are ______

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Q JEE MAIN 2022

If the uncertainty in velocity and position of a minute particle in space are, $2.4 \times 10^{-26}\left(\mathrm{~ms}^{-1}\right)$ and $10^{-7}(\mathrm{~m})$ respectively....

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Q JEE MAIN 2022

The spin-only magnetic moment value of an octahedral complex among $\mathrm{CoCl}_3 .4 \mathrm{NH}_3, \mathrm{NiCl}_2 .6 \mathrm{H}_2 \mathrm{O}$ and $...

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Q JEE MAIN 2022

If $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$ absorbs a light of wavelength 600 nm for d–d transition, then the value of octahedral crystal field...

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Q JEE MAIN 2022

Which of the following will have maximum stabilization due to crystal field?

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Q JEE MAIN 2022

Given below are two statements : Statement I : $[\mathrm{Ni}(\mathrm{CN}) 4]^2$ is square planar and diamagnetic complex. with $\mathrm{dsp}^2$ hybridization...

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Q JEE MAIN 2024

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ and $\left[\mathrm{CoF}_6\right]^{3-}$ are respectively known as:

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Q JEE MAIN 2022

White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of :

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Q JEE-Main 2022

Match List – I with List – II

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Q JEE MAIN 2024

Select the option with correct property –

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Q JEE MAIN 2024

Match List I with List II Choose the correct answer from the options given below :

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Q JEE MAIN 2024

Number of complexes which show optical isomerism among the following is $\_\_\_\_$ cis $-\left[\mathrm{Cr}(\mathrm{ox})_2 \mathrm{Cl}_2\right]^{3-},\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$, cis $-\left[\mathrm{Pt}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{2+}$, cis $...

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Q JEE MAIN 2024

The coordination geometry around the manganese in decacarbonyldimanganese (0)

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Q JEE MAIN 2024

The oxidation number of iron in the compound formed during brown ring test for $\mathrm{NO}_3^{-}$ion is

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Q JEE MAIN 2024

The Spin only magnetic moment value of square planar complex $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}\left(\mathrm{NH}_2 \mathrm{CH}_3\right)\right] \mathrm{Cl}$ is B.M. (Nearest integer) (Given atomic...

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Q JEE MAIN 2024

Identify from the following species in which $\mathrm{d}^2 \mathrm{sp}^3$ hybridization is shown by central atom:

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Q JEE MAIN 2024

A reagent which gives brilliant red precipitate with Nickel ions in basic medium is

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Q JEE MAIN 2024

The correct IUPAC name of $\mathrm{K}_2 \mathrm{MnO}_4$ is

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Q JEE MAIN 2025

A metal complex with a formula $\mathrm{MCl}_4 \cdot 3 \mathrm{NH}_3$ is involved in $\mathrm{sp}^3 \mathrm{~d}^2$ hybridisation. It upon reaction with...

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Q JEE MAIN 2025

The number of species from the following that are involved in $\mathrm{sp}^3 \mathrm{~d}^2$ hybridization is $$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}, \mathrm{SF}_6,\left[\mathrm{CrF}_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-} \text {...

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Q JEE MAIN 2025

' $X$ ' is the number of electrons in $t_{2 g}$ orbitals of the most stable complex ion among $...

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Q JEE MAIN 2025

The number of paramagnetic metal complex species among $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+},\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$, $\left[\mathrm{MnCl}_6\right]^{3-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ and $\left[\mathrm{FeF}_6\right]^{3-}$ with same number of unpaired electrons is...

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Q JEE MAIN 2025

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

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Q JEE MAIN 2025

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively :

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Q JEE MAIN 2025

Choose the incorrect trend in the atomic radii (r) of the elements.

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Q JEE MAIN 2025

' X ' is the number of acidic oxides among $\mathrm{VO}_2, \mathrm{~V}_2 \mathrm{O}_3, \mathrm{CrO}_3, \mathrm{~V}_2 \mathrm{O}_5$ and $\mathrm{Mn}_2 \mathrm{O}_7$. The...

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Q JEE MAIN 2025

Given below are two statements: Statement I : A homoleptic octahedral complex, formed using monodentate ligands, will not show stereoisomerism...

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Q JEE MAIN 2023

The observed magnetic moment of the complex $\left[\mathrm{Mn}(\mathrm{NCS})_6\right]^{\mathrm{x}-}$ is 6.06 BM. The numerical value of x is__

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Q JEE MAIN 2023

If $\mathrm{Ni}^{2+}$ is replaced by $\mathrm{Pt}^{2+}$ in the complex $\left[\mathrm{NiCl}_2 \mathrm{Br}_2\right]^{2-}$, which of the following properties are expected to get...

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Q JEE MAIN 2023

Match List I with List II. Choose the correct answer from the options given below:

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Q JEE MAIN 2023

The magnetic moment is measured in Bohr Magneton (BM). Spin only magnetic moment of Fe in $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ and $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$...

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Q JEE MAIN 2025

Identify the diamagnetic octahedral complex ions from below ; A. $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$ B. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ C. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$ D. $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{~F}_3\right]$ Choose...

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Q JEE MAIN 2023

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion...

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Q JEE MAIN 2023

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion...

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Q JEE MAIN 2023

Match List-I with List-II Choose the correct answer from the options given below :-

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Q JEE MAIN 2023

Match List-I with List-II Choose the correct answer from the options given below:

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Q JEE MAIN 2023

The correct order of the number of unpaired electrons in the given complexes is A. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ B. $\left[\mathrm{FeF}_6\right]^{3-}$

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Q JEE MAIN 2023

The number of species having a square planar shape from the following is _____.

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Q JEE MAIN 2023

The IUPAC name of $\mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]$ is-

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Q JEE-Main_2023

If the CFSE of $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ is $-96.0 \mathrm{~kJ} / \mathrm{ml}$, this complex will absorb maximum at wavelength ___ nm.(nearest...

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Q JEE MAIN 2023

The spin only magnetic moment of $\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_8\right]^{2+}$ complexes is $\_\_\_\_$ B.M. (Nearest integer) (Given : Atomic no. of Mn...

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Q JEE MAIN 2023

The denticity of the ligand present in the Fehling's reagent is_______.

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Q JEE MAIN 2023

Total number of moles of AgCl precipitated on addition of excess of $\mathrm{AgNO}_3$ to one mole each of the following...

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Q JEE MAIN 2023

$1 \mathrm{~L}, 0.02 \mathrm{M}$ solution of $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}$ is mixed with $1 \mathrm{~L}, 0.02 \mathrm{M}$ solution of $...

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Q JEE MAIN 2023

Formulae for Nessler's reagent is:

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Q JEE MAIN 2023

Which element is not present in Nessler's reagent ?

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Q JEE MAIN 2023

The complex cation which has two isomers is :

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Q JEE MAIN 2023

Match List I with List II

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Q JEE MAIN 2023

The $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ bond angle values in a fac $-\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$ complex is/are:

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Q JEE MAIN 2023

Match List I with List II:

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Q JEE MAIN 2023

In a reaction reagents 'X' and 'Y' respectively are

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Q JEE MAIN 2023

The hybridization and magnetic behaviour of cobalt ion in $\left.\left[\mathrm{Co}\left(\mathrm{NH}_3\right)\right]^3\right]^{3+}$ complex, respectively is

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Q JEE MAIN 2023

Correct order of spin only magnetic moment of the following complex ions is: (Given At. No. Fe: 26, Co:27)

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Q JEE MAIN 2023

Which of the following cannot be explained by crystal field theory?

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Q JEE MAIN 2023

The homoleptic and octahedral complex of $\mathrm{Co}^{2+}$ and $\mathrm{H}_2 \mathrm{O}$ has $\_\_\_\_$ unpaired electron(s) in the $t_{2 g}$ set of...

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Q JEE MAIN 2023

The complex with highest magnitude of crystal field splitting energy $\left(\Delta_0\right)$ is

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Q JEE MAIN 2023

In potassium ferrocyanide, there are ____ pairs of electrons in the $\mathrm{t}_{2 \mathrm{~g}}$ set of orbitals

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Q JEE MAIN 2023

The ratio of spin-only magnetic moment values

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Q JEE MAIN 2023

The complex

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Q JEE MAIN 2023

Which of the following complex has a possibility to exist as meridional isomer?

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Q JEE MAIN 2023

Match List I with List II Choose the correct answer from the options given below:

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Q JEE MAIN 2023

The set which does not have ambidentate ligand(s) is

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Q JEE MAIN 2023

The octahedral diamagnetic low spin complex among the following is

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Q JEEE MAIN 2023

The correct order of spin only magnetic moments for the following complex ions is

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Q JEE MAIN 2023

Number of ambidentate ligands in a representative metal complex $\left[\mathrm{M}(\mathrm{en})(\mathrm{SCN})_4\right]$ is [en = ethylenediamine]

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Q JEE MAIN 2023

Which of the following complex is octahedral, diamagnetic and the most stable?

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Q JEE MAIN 2023

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion...

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Q JEE MAIN 2023

The d-electronic configuration of $\left[\mathrm{CoCl}_4\right]^{2-}$ in tetrahedral crystal field is $\mathrm{e}^{\mathrm{m}} \mathrm{t}_2{ }^{\mathrm{n}}$. Sum of ' m ' and 'number...

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Q JEE MAIN 2023

The primary and secondary valencies of cobalt respectively in $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2$ are :

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Q JEE MAIN 2023

The sum of bridging carbonyls in W(CO)6 and Mn2 (CO)10 is ________ .

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Q JEE MAIN 2023

The d-electronic configuration of $\left[\mathrm{CoCl}_4\right]^{2-}$ in tetrahedral crystal field is $\mathrm{e}^{\mathrm{m}} t 2^{\mathrm{n}}$. Sum of 'm' and 'number of unpaired...

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Q JEE-Main_

To inhibit the growth of tumours, identify the compounds used from the following: (A) EDTA (B) Coordination Compounds of Pt...

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Q JEE-Main_2023

Which of the following is correct order of ligand field strength?

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Q JEE MAIN 2023

Which of the following complex will show largest splitting of d–orbitals?

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Q JEE MAIN 2023

Which of the following are the example of double salt? Choose the correct answer.

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Q JEE MAIN 2023

A solution of $\mathrm{FeCl}_3$ when treated with $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ gives a prussiun blue precipitate due to the formation of

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Q JEE MAINS 2023

Chiral complex from the following is : Here en = ethylene diamine

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Q JEE MAIN 2023

The primary and secondary valencies of cobalt respectively in $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2$ are :

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Q JEE MAIN 2024

Number of ambidentate ligands among the following is $\_\_\_\_$ $ \mathrm{NO}_2^{-}, \mathrm{SCN}^{-}, \mathrm{C}_2 \mathrm{O}_4^{2-}, \mathrm{NH}_3, \mathrm{CN}^{-}, \mathrm{SO}_4^{2-}, \mathrm{H}_2 \mathrm{O} $

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Q JEE MAIN 2024

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)....

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Q JEE MAIN 2024

Which of the following complex is homoleptic?

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Q JEE MAIN 2024

Given below are two statements: Statement (I): A solution of [Ni(H_2 O)_6 ]^(2+) is green in colour. Statement (II): A...

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Q JEE-Main_2024

The 'spin only' magnetic moment value of $\mathrm{MO}_4{ }^{2-}$ is BM. (Where M is a metal having least metallic radii....

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Q JEE-Main_2024

Number of complexes with even number of electrons in $t_{2 g}$ orbitals is - $...

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Q JEE MAIN 2024

The correct order of ligands arranged in increasing field strength.

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Q JEE MAINS 2024

Number of complexes from the following with even number of unpaired "d" electrons is

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Q JEE MAIN 2024

An octahedral complex with the formula $\mathrm{CoCl}_3 \mathrm{nNH}_3$ upon reaction with excess of $\mathrm{AgNO}_3$ solution given 2 moles of AgCl....

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Q JEE MAIN 2024

Consider the following complexes. The correct order of A, B, C and D in terms of wavenumber of light absorbed...

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Q JEE MAINS 2024

The correct sequence of ligands in the order of decreasing field strength is

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Q JEE MAIN 2024

The 'Spin only' Magnetic moment for $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}$ is $\_\_\_\_$ $\times 10^{-1} \mathrm{BM}$. ( given = Atomic number of Ni: 28)

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Q JEE MAIN 2024

Choose the correct Statements from the following: (A) Ethane-1 2-diamine is a chelating ligand. (B) Metallic aluminium is produced by...

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Q JEE MAIN 2024

The correct statements from following are: A. The strength of anionic ligands can be explained by crystal field theory. B....

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Q JEE MAIN 2024

In which one of the following metal carbonyls, CO forms a bridge between metal atoms?

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Q JEE MAIN 2025

The spin-only magnetic moment value of $M^{n+}$ ion formed among $\mathrm{Ni}, \mathrm{Zn}, \mathrm{Mn}$ and Cu that has the least enthalpy...

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Q JEE MAIN 2025

The d-orbital electronic configuration of the complex among $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+},\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ and $\left[\mathrm{Zn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ that has the highest CFSE is :

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Q JEE MAIN 2025

The type of hybridization and the magnetic property of $\left[\mathrm{MnCl}_{6}\right]^{3-}$ are

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Q JEE MAIN 2024

Consider the following complex ions $\begin{aligned} & \mathrm{P}=\left[\mathrm{FeF}_6\right]^{3-} \\ & \mathrm{Q}=\left[\mathrm{V}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \\ & \mathrm{R}=\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\end{aligned}$ The correct order of...

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Q JEE MAIN 2024

Which of the following electronic configuration would be associated with the highest magnetic moment?

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Q JEE MAIN 2025

Consider the following low-spin complexes $\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{NO}_{2}\right)_{6}\right], \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right], \mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right], \mathrm{Cu}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ and $\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$. The sum of the spin-only magnetic moment values of...

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Q JEE MAIN 2025

The calculated spin-only magnetic moments of $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{OH})_{6}\right]$ and $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{OH})_{6}\right]$ respectively are :

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Q JEE MAIN 2025

Identify the homoleptic complexes with odd number of d electrons in the central metal :[0pt] [JEE MAIN\_290125\_S2] [Coordination] [T-5] [Ea\$...

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Q JEE MAIN 2025

The number of paramagnetic complexes among ${\left[ {{\rm{Fe}}{{\rm{F}}_6}} \right]^{3-}},{\left[ {{\rm{Fe}}{{({\rm{CN}})}_6}} \right]^{3-}},{\left[ {{\rm{Mn}}{{({\rm{CN}})}_6}} \right]^{3 - }}$, $...

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Q JEE MAIN 2025

An octahedral complex having molecular composition ${\rm{Co}}.5{\rm{N}}{{\rm{H}}_3} \cdot {\rm{C}}{{\rm{l}}^2}.{\rm{S}}{{\rm{O}}_4}$ has two isomers A and B. The solution of A gives...

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Q JEE MAIN 2025

Which one of the following complexes will have ${\Delta _0} = 0$ and $\mu = 5.96$ B.M?

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Q JEE MAIN 2025

Number of stereoisomers possible for the complexes, $\left[ {{\rm{CrC}}{{\rm{l}}_3}{{({\rm{py}})}_3}} \right]$ and ${\left[ {{\rm{CrC}}{{\rm{l}}_2}{{({\rm{ox}})}_2}} \right]^{3 - }}$ are respectively (py =...

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Q JEE MAIN 2025

Total number of molecules/species from following which will be paramagnetic is $\mathrm{O}_{2}, \mathrm{O}_{2}^{+}, \mathrm{O}_{2}^{-}, \mathrm{NO}, \mathrm{NO}_{2}, \mathrm{CO}, \mathrm{K}_{2}\left[\mathrm{NiCl}_{4}\right],\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}, \mathrm{~K}_{2}\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]$

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Q JEE MAIN 2025

The spin only magnetic moment $(\mu)$ value (B.M.) of the compound with strongest oxidising power among $\mathrm{Mn}_{2} \mathrm{O}_{3}$, TiO and...

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Q JEE MAIN 2025

Match List - I with List - II.[0pt] Choose the correct answer from the options given below :

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Q JEE MAIN 2025

The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is _____ $...

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Q JEE MAIN 2025

Match the LIST-I with LIST-II

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The correct order of the complexes $...

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Q JEE MAIN 2025

Match List - I with List - II.[0pt] Choose the correct answer from the options given below :

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Q JEE MAIN 2025

The conditions and consequence that favours the $\mathrm{t}_{2_{\mathrm{g}}^{3}} \mathrm{e}_{\mathrm{g}}^{1}$ configuration in a metal complex are :

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Q JEE MAIN 2025

A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential $...

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Q JEE MAIN 2025

Given below are two statements : Statement (I): In octahedral complexes, when ${\Delta _o} < P$ high spin complexes are...

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Q JEE MAIN 2025

Identify the coordination complexes in which the central metal ion has $d^{4}$ configuration. Choose the correct answer from the options...

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Q JEE MAIN 2025

Match List - I with List - II.

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Q JEE MAIN 2025

The correct increasing order of stability of the complexes based on ${\Delta _0}$ value is : I. $...

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Q JEE MAIN 2025

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet...

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Q JEE MAIN 2025

One mole of the octahedral complex compound ${\rm{Co}}{\left( {{\rm{N}}{{\rm{H}}_3}} \right)_5}{\rm{C}}{{\rm{l}}_3}$ gives 3 moles of ions on dissolution in water. One...

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Q JEE MAIN 2025

The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is:

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Q JEE MAIN 2025

The correct set of ions (aqueous solution) with same colour from the following is:

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Q JEE MAIN 2025

The complex that shows Facial - Meridional isomerism is:

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Q JEE MAIN 2025

Identify the homoleptic complex(es) that is/are low spin. (A) $\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-}$ (B) $\left[\mathrm{CoF}_6\right]^{3-}$ (C) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$ (D) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ (E) $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$...

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Q JEE MAIN 2025

From the magnetic behaviour of $\left[\mathrm{NiCl}_4\right]^{2-}$ (paramagnetic) and $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ (diamagnetic), choose the correct geometry and oxidation state.

JEE Main Chemistry Medium

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Q JEE MAIN 2025

In which of the following complexes the CFSE, ${\Delta _{\rm{o}}}$ will be equal to zero ?

JEE Main Chemistry Medium

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Q JEE MAIN 2025

The complex of $\mathrm{Ni}^{2+}$ ion and dimethyl glyoxime contains $\_\_\_\_$ number of Hydrogen $(\mathrm{H})$ atoms.

JEE Main Chemistry Medium

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Q JEE MAIN 2025

The correct order of the following complexes in terms of their crystal field stabilization energies is :

JEE Main Chemistry Medium

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