Q JEE MAIN_2026

Given below are two statements for catalytic properties of transition metals. Statement I: First row transition metals which act as...

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Q JEE MAIN 2026

The correct order of first $\left(\Delta_i \mathrm{H}_1\right)$ and second $\left(\Delta_i \mathrm{H}_2\right)$ ionisation enthalpy values of Cr and Mn are :A....

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Q JEE MAIN_2026

Given below are two statements Statement I : The number of pairs among $\left[\mathrm{Ti}^{4+}, \mathrm{V}^{2+}\right],\left[\mathrm{V}^{2+}, \mathrm{Mn}^{2+}\right],\left[\mathrm{Mn}^{2+}, \mathrm{Fe}^{3+}\right]$ and $\left[\mathrm{V}^{2+}, \mathrm{Cr}^{2+}\right]$...

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Q JEE MAIN_2026

The correct statements among the following are. A. Basic vanadium oxide is used in the manufacture of $\mathrm{H}_2 \mathrm{SO}_4$. B....

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Q JEE MAIN_2026

A paper dipped in a dil. $\mathrm{H}_2 \mathrm{SO}_4$ solution of ' $X$ ' upon treatment with $\mathrm{SO}_2$ gas turns into...

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Q JEE MAIN_2026

Which of the following is NOT a physical or chemical characteristics of interstitial compounds?

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Q JEE MAIN_2026

Consider $|\mathrm{x}|$ is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions...

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Q JEE MAIN_2026

Pairs of elements with the same number of electrons in their respective 4 f orbital are [Atomic number. Eu-63, Gd-64,...

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Q JEE MAIN_2026

Correct statements from the following are A. Potassium dichromate is an oxidising agent and it oxidises $\mathrm{FeSO}_4$ to $\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3$ in...

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Q JEE MAIN_2026

The correct statements among the following are, A. $\mathrm{Mo}(\mathrm{VI})$ and $\mathrm{W}(\mathrm{VI})$ are less stable than $\mathrm{Cr}(\mathrm{VI})$. B. $\mathrm{Ce}^{4+}$ and $\mathrm{Tb}^{4+}$...

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Q JEE MAIN_2026

Number of paramagnetic ions among the following $d$ - and $f$-block metal ions is $\_\_\_\_$ . $$ \mathrm{Mn}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+},...

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Q JEE Main 2026

Which of the following sets includes all the species that will change the orange colour of $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ in...

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Q JEE MAIN 2026

Given below are two statements: Statement 1: The number of pairs, from the following, in which both the ions are...

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Q JEE MAIN 2026

"X" is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6...

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Q JEE MAIN_2026_

Consider the following statements about manganate and permanganate ions. Identify the correct statements. A. The geometry of both manganate and...

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Q JEE MAIN 2026

The oxidation state of chromium in the final product formed in the reaction between KI and acidified $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$...

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Q JEE MAIN 2026

Identify the metal ions among $\mathrm{Co}^{2+}, \mathrm{Ni}^{2+}, \mathrm{Fe}^{2+}, \mathrm{V}^{3+}$ and $\mathrm{Ti}^{2+}$ having a spin-only magnetic moment value more than 3.0...

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Q JEE MAIN 2026

Given below are some of the statements about Mn and $\mathrm{Mn}_2 \mathrm{O}_7$. Identify the correct statements. A. Mn forms the...

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Q JEE MAIN 2026

Among the following oxides of 3 d elements, the number of mixed oxides are $\_\_\_\_$ $...

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Q JEE MAIN 2026

Given below are two statements : Statement I: The first ionization enthalpy of Cr is lower than that of Mn...

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Q JEE MAIN_2026_

Consider the following reactions : $$ \begin{aligned} & \mathrm{NaCl}+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{~A}+\mathrm{KHSO}_4+\mathrm{NaHSO}_4+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{~A}+\mathrm{NaOH} \rightarrow \mathrm{~B}+\mathrm{NaCl}+\mathrm{H}_2...

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Q JEE MAIN_2026_

$\mathrm{MnO}_4{ }^{2-}$, in acidic medium, disproportionates to :

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Q JEE MAIN_2026

Consider the following reactions. $\mathrm{PbCl}_2+\mathrm{K}_2 \mathrm{CrO}_4 \rightarrow \mathrm{~A}+2 \mathrm{KCl}$ (Hot solution) $$ \begin{aligned} & \mathrm{A}+\mathrm{NaOH} \rightleftharpoons \mathrm{~B}+\mathrm{Na}_2 \mathrm{CrO}_4 \\ &...

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Which of the following is a thermosetting polymer?

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Q JEE MAIN 2019

An example of a disproportionation reaction is

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Q JEE MAIN 2020

The oxidation states of transition metal atoms in $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7, \mathrm{KMnO}_4$ and $\mathrm{K}_2 \mathrm{FeO}_4$, respectively, are $\mathrm{x}, \mathrm{y}$ and...

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Q JEE MAIN 2019

Thermal decomposition of a Mn compound $(\mathrm{X})$ at 513 K results in compound $\mathrm{Y}, \mathrm{MnO}_2$ and a gaseous product. $\mathrm{MnO}_2$...

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Q JEE MAIN 2019

Good reducing nature of $\mathrm{H}_3 \mathrm{PO}_2$ is attributed to the presence of:

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Q JEE MAIN 2019

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Q JEE MAIN_2019_

The alloy used in the construction of aircrafts is :

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Consider the hydrated ions of $\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Ti}^{3+}$, and $\mathrm{Sc}^{3+}$. The correct order of their spin-only magnetic moments is i.

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Q JEE MAIN 2019

The pair that has similar atomic radii is :

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Q JEE MAIN_2019_

Which of the following is a condensation polymer?

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Q JEE MAIN 2019

The transition element that has lowest enthalpy of atomisation, is

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Q JEE MAIN 2019

The transition element that has lowest enthalpy of atomisation, is

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Q JEE MAIN 2019

The correct order of atomic radii is

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Q JEE MAIN 2020

The correct electronic configuration and spinonly magnetic moment (BM) of $\mathrm{Gd}^{3+}(\mathrm{Z}=64)$, respectively, are

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Q JEE MAIN 2020

The lanthanoid that does NOT show +4 oxidation state is

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Q JEE MAIN 2020

Mischmetal is an alloy consisting mainly of

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Q JEE MAIN 2020

The electronic configurations of bivalent europium and trivalent cerium are (atomic number : Xe = 54, Ce = 58, Eu...

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Q JEE MAIN 2020

The third ionization enthalphy is minimum for

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Q JEE-MAIN 2020

Boron and silicon of very high purity can be obtained through

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Q JEE MAIN 2019

The correct order of the first ionization enthalpies is :

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Q JEE-MAIN 2020

Reaction of ammonia with excess Cl2 gives

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Q JEE MAIN 2019

The highest possible oxidation states of uranium and plutonium, respectively, are :

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Q JEE Main 2019

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means

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Q JEE MAIN 2020

The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ____________...

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Q JEE MAIN 2020

The reaction in which the hybridisation of the underlined atom is affected is

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Q JEE MAIN 2020

The incorrect statement(s) among (a) - (c) is (are) (a) W(VI) is more stable than Cr(VI). (b) In the presence...

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Q JEE MAIN 2019

$$ \begin{aligned} & \underline{\mathrm{A}} \xrightarrow{4 \mathrm{KOH}, \mathrm{O}_2} \underset{(\text { Green })}{2 \mathrm{~B}}+2 \mathrm{H}_2 \mathrm{O} \\ & \underline{3 \mathrm{~B}} \xrightarrow{4 \mathrm{HCl}}...

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Q JEE MAIN 2020

White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound (X). (X)...

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Q JEE MAIN 2019

The maximum number of possible oxidation states of actinoides are shown by

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Q JEE MAIN 2021

In which one of the following sets all species show disproportionation reaction ?

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Q JEE MAIN 2021

The correct structures of A and B formed in the following reactions are

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Q JEE MAIN 2021

Potassium permanganate on heating at 513 K gives a product which is

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Q JEE MAIN 2021

Match List-I with List-II :

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Q JEE MAIN 2021

The incorrect statement is:

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Q JEE MAIN 2019

The difference in the number of unpaired electrons of a metal ion in its high spin and low-spin octahedral complexes...

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Q JEE MAIN 2021

The $\mathrm{Eu}^{2+}$ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number...

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Q JEE MAIN 2021

The addition of dilute NaOH to $\mathrm{Cr}^{3+}$ salt solution will give :

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Q JEE MAIN 2021

The number of f electrons in the ground state electronic configuration of Np (Z = 93) is ________. (Nearest integer)

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Q JEE-MAIN 2021

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is :

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Q JEE MAIN 2021

The nature of oxides $\mathrm{V}_2 \mathrm{O}_3$ and CrO is indexed as ' X ' and ' Y ' type respectively....

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Q JEE-MAIN 2021

Hydrogen peroxide reacts with iodine in basic medium to give :

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Q JEE-MAIN 2021

In the given chemical reaction, colors of the $\mathrm{Fe}^{2+}$ and $\mathrm{Fe}^{3+}$ ions, , are respectively : $...

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Q JEE MAIN 2021

In the given chemical reaction, colors of the $\mathrm{Fe}^{2+}$ and $\mathrm{Fe}^{3+}$ ions, are respectively $$ 5 \mathrm{Fe}^{2+}+\mathrm{MnO}_4^{-}+8 \mathrm{H}^{+} \rightarrow \mathrm{Mn}^{2+}+4...

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Q JEE MAIN 2021

In the structure of the dichromate ion, there is a :

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Q JEE MAIN 2019

The lanthanide ion that would show color is

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Q JEE MAIN 2021

Which one of the following metals forms interstitial hydride easily ?

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Q JEE MAIN 2021

The set having ions which are coloured and paramagnetic both is -

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Q JEE MAIN 2019

The statement that is INCORRECT about the interstitial compounds is

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Q JEE-MAIN 2021

The number of chlorine atoms in 20 mL of chlorine gas at STP is_____$10^2$. (Round off to the Nearest Integer)....

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Q JEE-MAIN 2021

One of the by-products formed during the recovery of NH3 from Solvay process is :

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Q JEE MAIN 2021

The oxide that shows magnetic property is :

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Q JEE-Main-2021_

The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product ' A...

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Q JEE MAIN 2021

Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin...

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Q JEE MAIN 2021

$F_2 x_2$ and $F e y_3$ are known when $x$ and $y$ are :

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Q JEE MAIN 2021

The incorrect statement among the following is :-

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Q JEE MAIN 2021

What is the correct order of the following elements with respect to their density ?

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Q JEE MAIN 2021

In polymer Buna-S: 'S' stands for :-

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Given below are two statements: Statement I : Potassium permanganate on heating at 573 K forms potassium manganate. Statement II...

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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

What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene

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Q JEE MAIN 2021

The major components of German Silver are :

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Q JEE MAIN 2021

Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ______.

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Q JEE MAIN 2021

A homogeneous ideal gaseous reaction $\mathrm{AB}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{A}_{(\mathrm{g})}+2 \mathrm{~B}_{(\mathrm{g})}$ is carried out in a 25 litre flask at $27^{\circ} \mathrm{C}$....

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Q JEE MAIN 2021

Complete combustion of 750 g of an organic compound provides 420 g of $\mathrm{CO}_2$ and 210 g of $\mathrm{H}_2 \mathrm{O}$....

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Q JEE-MAIN 2021

A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides....

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Q JEE MAIN 2021

Which one of the following lanthanoids does not form $\mathrm{MO}_2$ ? [ M is lanthanoid metal]

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Q JEE MAIN 2021

On treating a compound with warm dil. $\mathrm{H}_2 \mathrm{SO}_4$, gas X is evolved which turns $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ paper acidified...

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Q JEE MAIN 2021

The electrode potential of $\mathrm{M}^{2+} / \mathrm{M}$ of 3d-series elements shows positive value of :

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Q JEE MAIN 2021

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Q JEE MAIN 2021

The major components in "Gun Metal" are :

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Q JEE MAIN 2021

Match List-I with List-II :

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Q JEE MAIN 2021

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R ;...

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Q JEE MAIN 2021

Ellingham diagram is a graphical representation of:

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Q JEE MAIN 2021

Given below are two statements: Statement I: $\mathrm{CeO}_2$ can be used for oxidation of aldehydes and ketones. Statement 11 :...

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Q JEE MAIN 2022

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

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Q JEE MAIN 2022

The total number of $\mathrm{Mn}=\mathrm{O}$ bonds in $\mathrm{Mn}_2 \mathrm{O}_7$ is $\_\_\_\_$

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Q JEE MAIN 2022

Given below are two statements: Statement I : Iron (III) catalyst, acidified $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and neutral $\mathrm{KMnO}_4$ have the...

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Q JEE-Main 2022

Among $\mathrm{Co}^{3+}, \mathrm{Ti}^{2+}, \mathrm{V}^{2+}$ and $\mathrm{Cr}^{2+}$ ions, one if used as a reagent cannot liberate $\mathrm{H}_2$ from dilute mineral acid...

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Q JEE MAIN 2022

The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic...

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Q JEE MAIN 2022

Which of the following has least tendency to liberate $\mathrm{H}_2$ from mineral acids?

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Q JEE MAIN 2022

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

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Q JEE MAIN 2022

The metal that is not extracted from its sulphide ore is :

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Q JEE MAIN 2022

In neutral or alkaline solution, $\mathrm{MnO}_4^{-}$ oxidises thiosulphate to:

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Q JEE MAIN 2022

Which of the following 3d-metal ion will give the lowest enthalpy of hydration $\left(\Delta_{\text {hyd }} \mathrm{H}\right)$ when dissolved in...

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Q JEE MAIN 2022

Which of the following pair is not isoelectronic species? (At. no. Sm, 62; Er, 68: Yb, 70: Lu, 71; Eu,...

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Q JEE MAIN 2022

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :

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Q JEE MAIN 2022

In metallurgy the term "gangue" is used for:

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Q JEE MAIN 2022

The dark purple colour of KMnO4 disappears in the titration with oxalic acid in acidic medium. The overall change in...

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Q JEE-Main 2022

The reaction of $\mathrm{H}_2 \mathrm{O}_2$ with potassium permanganate in acidic medium leads to the formation of mainly:

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Q JEE-Main 2022

The compound(s) that is(are) removed as slag during the extraction of copper is i. (1) CaO (2) FeO (3) $...

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Q JEE MAIN 2022

The ‘f’ orbitals are half and completely filled, respectively in lanthanide ions (Given: Atomic no. Eu, 63; Sm, 62; Tm,...

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Q JEE MAIN 2022

In 3d series, the metal having the highest $\mathrm{M}^{2+} / \mathrm{M}$ standard electrode potential is

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Q JEE MAIN 2022

Statement I : Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of...

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Q JEE-MAIN 2022

Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas?

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Q JEE-Main 2022

Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in...

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Q JEE MAIN 2022

The measured BOD values for four different water samples (A-D) are as follows: $...

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Q JEE MAIN 2022

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from...

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Q JEE MAIN 2022

Which one of the following is an example of disproportionation reaction?

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Q JEE MAIN 2022

The role of depressants in Froth Flotation method* is to

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Q JEE MAIN 2022

Which of the following elements in considered as a metalloid?

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A rigid nitrogen tank stored inside a laboratory has a pressure of 30 atm at 06:00 am when the temperature...

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Q JEE MAIN 2022

The metal ion (in gaseous state) with lowest spin only magnetic moment value is

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Q JEE-MAIN 2022

Given below are two statements. Statement I: During electrolytic refining, blister copper deposits precious metals Statement II: In the process...

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Q JEE-Main 2024

Which of the following chemical reactions represents Hall-Heroult Process?

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Q JEE-Main 2022

Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be

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Q JEE MAIN 2022

An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation...

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Q JEE MAIN 2022

The number of terminal oxygen atoms present in the product B obtained from the following reaction is ________. $...

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Q JEE-Main 2022

The difference in oxidation state of chromium in chromate and dichromate salts is _______.

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Q JEE MAIN 2022

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction...

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Q JEE MAIN 2022

The spin–only magnetic moment value of the most basic oxide of vanadium among $\mathrm{V}_2 \mathrm{O}_3, \mathrm{~V}_2 \mathrm{O}_4$ and $\mathrm{V}_2 \mathrm{O}_5$...

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Q JEE MAIN 2022

2.0 g of H2 gas is adsorbed on 2.5 g of platinum powder at 300 K and 1 bar pressure....

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Q JEE MAIN 2022

The electronic configuration of Pt (atomic number 78) is:

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Q JEE MAIN 2022

Which one of the lanthanoids given below is the most stable in divalent form?

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Q JEE MAIN 2024

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the...

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Q JEE-Main 2022

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

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Q JEE MAIN 2024

Number of moles of $\mathrm{H}^{+}$ions required by 1 mole of $\mathrm{MnO}_4^{-}$to oxidise oxalate ion to $\mathrm{CO}_2$ is $\_\_\_\_$

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Q JEE MAIN 2022

Given are two statements one is labelled as Assertion A and other is labelled as Reason R. Assertion A :Magnesium...

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Q JEE MAIN 2024

Given below are two statements: Statement (I): Dimethyl glyoxime forms a six membered covalent chelate when treated with $\mathrm{NiCl}_2$ solution...

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Q JEE MAIN 2024

Choose the correct statements from the following A. $\mathrm{Mn}_2 \mathrm{O}_7$ is an oil at room temperature B. $\mathrm{V}_2 \mathrm{O}_4$ reacts...

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Q JEE MAIN 2022

Given below are two statements: Statement I : According to the Ellingham diagram, any metal oxide with higher $\Delta \mathrm{G}^{\circ}$...

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Q JEE MAIN 2022

Among the following, which is the strongest oxidizing agent ?

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Q JEE MAIN 2022

Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?

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Q JEE MAIN 2024

Which of the following compounds show color due to d-d transition?

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Q JEE MAIN 2022

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with...

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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). Assertion...

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Q JEE MAIN 2024

The transition metal having highest $3^{\text {rd }}$ ionisation enthalpy is :

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Q JEE MAIN 2024

Number of metal ions characterized by flame test among the following is $\_\_\_\_$ $$ \mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Co}^{2+},...

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Q JEE MAIN 2024

Alkaline oxidative fusion of MnO_2 gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively...

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Q JEE MAIN 2024

The orange colour of $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and purple colour of $\mathrm{KMnO}_4$ is due to

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Q JEE MAIN 2024

Which of the following statements are correct about Zn,Cd and Hg ?A. They exhibit high enthalpy of atomization as the...

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Q JEE MAIN 2024

Which of the following acts as a strong reducing agent? (Atomic number : $\mathrm{Ce}=58, \mathrm{Eu}=63, \mathrm{Gd}= 64, \mathrm{Lu}=71$ )

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Q JEE MAIN 2024

Choose the correct option having all the elements with d^10 electronic configuration from the following:

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Q JEE MAIN 2024

Given below are two statements : Statement (I): In the Lanthanoids, the formation of $\mathrm{Ce}^{+4}$ is favoured by its noble...

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Q JEE MAIN 2023

If $A=\frac{1}{5!6!7!}\left[\begin{array}{lll}5! & 6! & 7! \\ 6! & 7! & 8! \\ 7! & 8! & 9!\end{array}\right]$, then $...

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Q JEE MAIN 2025

The correct decreasing order of spin only magnetic moment values (BM) of $\mathrm{Cu}^{+}, \mathrm{Cu}^{2+}, \mathrm{Cr}^{2+}$ and $\mathrm{Cr}^{3+}$ ions is :

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Q JEE MAIN 2025

The incorrect relationship in the following pairs in relation to ionisation enthalpies is :

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Q JEE MAIN 2025

Among, and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that...

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Q JEE MAIN 2025

Given below are two statements: Statement I : $\mathrm{CrO}_3$ is a stronger oxidizing agent than $\mathrm{MoO}_3$ Statement II: $\mathrm{Cr}(\mathrm{VI})$ is...

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Q JEE MAIN 2023

Given below are two statements: Statement-I : In the metallurgy process, sulphide ore is converted to oxide before reduction. Statement-II...

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Q JEE MAIN 2023

In Hall – Heroult process, the following is used for reducing $\mathrm{Al}_2 \mathrm{O}_3$ :-

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Which one of the following elements will remain as liquid inside pure boiling water?

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During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which...

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Which of the following elements have half-filled f-orbitals in their ground state ? (Given : atomic number Sm = 62;...

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Which one of the following statements is incorrect ?

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Consider the following equation : $$ 2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_3(\mathrm{~g}), \Delta \mathrm{H}=-190 \mathrm{~kJ} $$ The number of factors which...

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

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$\mathrm{KMnO}_4$ oxidises I- in acidic and neutral/faintly alkaline solution, respectively to

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A solution of $\mathrm{CrO}_5$ in amyl alcohol has a $\_\_\_\_$ colour

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Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from

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$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ paper acidified with dilute $\mathrm{H}_2 \mathrm{SO}_4$ turns green when exposed to

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Q JEE MAIN 2023

Which one amongst the following are good oxidizing agents? Choose the most appropriate answer from the options given below :

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Q JEE MAIN 2023

The pair of lanthanides in which both elements have high third -ionization energy is:

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Q JEE MAIN 2023

CIF5 at room temperature is a:

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Q JEE MAIN 2023

In the extraction process of copper, the product obtained after carrying out the reactions

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The mismatched combinations are A. Chlorophyll - Co B. Water hardness - EDTA C. Photography - $[\mathrm{Ag}(\mathrm{CN}) 2]^{-}$ D. Wilkinson...

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Q JEE MAIN 2023

Which halogen is known to cause the reaction given below: $2 \mathrm{Cu}^{2+}+4 \mathrm{X}^{-} \rightarrow \mathrm{Cu}_2 \mathrm{X}_2(\mathrm{~s})+\mathrm{X}_k$

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When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a...

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Which of the following statements are correct? (A) The $\mathrm{M}^{3+} / \mathrm{M}^{2+}$ reduction potential for iron is greater than manganese...

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In chromyl chloride, the number of d-electrons present on chromium is same as in (Given atomic no. of Jii 22,...

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Given below are two statements Statement-I: Aqueous solution of $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is preferred as a primary standard in volumetric...

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Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to

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Strong reducing and oxidizing agents among the following, respectively, are

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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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The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is________.

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The number of paramagnetic species from the following is_____.

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The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is

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How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? $\_\_\_\_$ (Given:...

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Given below are two statements: Statement I: Chlorine can easily combine with oxygen to from oxides: and the product has...

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A obtained by Ostwald‟s method involving air oxidation of NH3, upon further air oxidation produces “B”. “B” on hydration forms...

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Highest oxidation state of Mn is exhibited in Mn2O7. The correct statements about Mn2O7 are (A) Mn is tetrahedrally surrounded...

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The bond dissociation energy is highest for

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Q JEE MAIN 2023

$\mathrm{Nd}^{2+}=$

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For 1 mol of gas, the plot of pV vs p is shown below. p is the pressure and V...

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The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is

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Q JEE MAIN 2024

Number of colourless lanthanoid ions among the following is…. Eu^(3+),Lu^(3+),Nd^(3+),La^(3+),Sm^(3+)

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Q JEE MAIN 2024

The number of white coloured salts among the following is (A) SrSO_4 (B) Mg(NH_4 ) PO_4 (c) BaCrO_4 (D) Mn(OH)_2...

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Identify the incorrect statements regarding primary standard of titrimetric analysis (A) It should be purely available in dry form. (B)...

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Given below are two statements : Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium...

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The electronic configuration of $\mathrm{Cu}($ □ II) is $3 \mathrm{~d}^9$ whereas that of $\mathrm{Cu}(\mathrm{I})$ is $3 \mathrm{~d}^{10}$. Which of the...

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Q JEE MAIN 2024

Consider the following reaction $\mathrm{MnO}_2+\mathrm{KOH}+\mathrm{O}_2 \rightarrow \mathrm{~A}+\mathrm{H}_2 \mathrm{O}$ Product ' $A$ ' in neutral or acidic medium disproportionate to give...

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Among $\mathrm{CrO}, \mathrm{Cr}_2 \mathrm{O}_3$ and $\mathrm{CrO}_3$, the sum of spin-only magnetic moment values of basic and amphoteric oxides is $\_\_\_\_$...

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The spin only magnetic moment value of the ion among Ti^(2+),V^(2+),Co^(3+) and Cr^(2+), that acts as strong oxidising agent in...

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The element which shows only one oxidation state other than its elemental form is :

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Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. $\mathrm{Fe}^{3+}$ oxidises the iodide ion B. $\mathrm{Fe}^{3+}$...

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The difference in the 'spin-only' magnetic moment values of $\mathrm{KMnO}_4$ and the manganese product formed during titration of $\mathrm{KMnO}_4$ against...

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Q JEE MAIN 2024

The metal that shows highest and maximum number of oxidation state is:

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Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, Cr=24,Mn=25,Fe=26,Co=27 ]

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The number of element from the following that do not belong to lanthanoids is : Eu,Cm,Er,Tb,Yb and Lu

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Given below are two statements: Statement-I: The gas liberated on warming a salt with dil H_2 SO_4, turns a piece...

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Molar mass of the salt from $\mathrm{NaBr}, \mathrm{NaNO}_3, \mathrm{KI}$ and $\mathrm{CaF}_2$ which does not evolve coloured vapours on heating with...

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Q JEE MAIN 2024

In alkaline medium. MnO_4^-oxidises I^-to

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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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KMnO_4 decomposes on heating at 513" " K to form O_2 along with

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Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C....

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The compound that is white in color is

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Diamagnetic Lanthanoid ions are:

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Q JEE MAIN 2024

In chromyl chloride test for confirmation of Cl^- ion, a yellow solution is obtained. Acidification of the solution and addition...

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Q JEE MAIN 2024

Match List I with List II List-I List-II (Substances) (Element present) A. Ziegler catalyst I. Rhodium B. Blood Pigment II....

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Q JEE MAIN 2024

The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]

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Q JEE MAIN 2025

The first transition series metal 'M' has the highest enthalpy of atomisation in its series. One of its aquated ion...

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Q JEE MAIN 2025

The number of valence electrons present in the metal among ${\rm{Cr}},{\rm{Co}},{\rm{Fe}}$ and Ni which has the lowest enthalpy of atomisation...

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Q JEE MAIN 2025

Pair of transition metal ions having the same number of unpaired electrons is

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Consider the following reactions $...

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The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are : A. ${\rm{C}}{{\rm{r}}^{2 + }}$...

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Q JEE MAIN 2025

Choose the correct tests with respective observations. (A) $CuS{O_4}$ (acidified with acetic acid) $ + {K_4}\left[ {Fe{{(CN)}_6}} \right] \to $...

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Q JEE MAIN 2025

Match List - I with List - II. List - I List - II (A) Bronze (I) (B) Brass (II)...

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Consider the following reactions $$ \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \xrightarrow[-\mathrm{H}_{2} \mathrm{O}]{\mathrm{KOH}}[\mathrm{~A}] \xrightarrow[-\mathrm{H}_{2} \mathrm{O}]{\mathrm{H}_{2} \mathrm{O}_{4}}[\mathrm{~B}]+\mathrm{K}_{2} \mathrm{SO}_{4} $$ The products $[\mathrm{A}]$ and $[\mathrm{B}]$,...

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The molar mass of the water insoluble product formed from the fusion of chromite ore (${\rm{FeC}}{{\rm{r}}_2}{{\rm{O}}_4}$) with ${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}$ in presence...

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The correct option with order of melting points of the pairs $({\rm{Mn}},{\rm{Fe}}),({\rm{Tc}},{\rm{Ru}})$ and $({\rm{Re}},{\rm{Os}})$ is :

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Q JEE MAIN 2025

Preparation of potassium permanganate from ${\rm{Mn}}{{\rm{O}}_2}$ involves two step process in which the 1st step is a reaction with KOH...

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Q JEE MAIN 2025

Niobium (Nb) and ruthenium (Ru) have "x" and "y" number of electrons in their respective 4 d orbitals. The value...

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