Competishun Header
Competishun
Contact Us
Back

Report Issue

JEE MAIN 2023
08-04-2023
Question
Which of the following complex is octahedral, diamagnetic and the most stable?
Select the correct option:
A
$\mathrm{Na}_3\left[\mathrm{CoCl}_6\right]$
B
$\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_3\right] \mathrm{Cl}_2$
C
$\mathrm{K}_3\left[\mathrm{Ca}(\mathrm{CN})_8\right]$
D
$\left.\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right) \&\right]_0\right]_2$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Sol. $\quad \mathrm{Co}^{+3}=\mathrm{t}_2 \mathrm{~g}^6 \mathrm{eg}^0$ $\mathrm{CN}^{-}$-strong field ligand All d-electrons should be paired ( $\mu_{\mathrm{s}}=0$ ) Hence diamagnetic.
Question Tags
JEE Main
Chemistry
Easy
Start Preparing for JEE with Competishun
YouTube
Books
App
Tests
Filters 0
JEE Main
JEE Advance
Easy
Medium
Hard
Showing 18 questions
QJEE Main 20242024
An amine ( X ) is prepared by ammonolysis of benzyl chloride. On adding p-toluenesulphonyl chloride to it the solution...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
The correct IUPAC name of $\left[\mathrm{PtBr}_2\left(\mathrm{PMe}_3\right)_2\right]$ is:
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
Evaluate the following statements related to group 14 elements for their correctness
(A) Covalent radius decreases down the group...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
The correct statements among the following, for a "chromatography" purification method is:
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
The number of ions from the following that are expected to behave as oxidising agent is:
$...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
Given below are two statements:
Statement I: $\mathrm{PF}_5$ and $\mathrm{BrF}_5$ both exhibit $\mathrm{sp}^3 \mathrm{~d}$ hybridisation.
Statement II: Both...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
The incorrect statement regarding the geometrical isomers of 2-butene is:
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
Arrange the following elements in the increasing order of number of unpaired electrons in it.
(A) Sc (B) Cr...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
How can an electrochemical cell be converted into an electrolytic cell ?
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
The incorrect statements regarding enzymes are:
(A) Enzymes are biocatalysts.
(B) Enzymes are non-specific and can catalyse different...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
Molality (m) of 3 M aqueous solution of NaCl is: (Given : Density of solution $=1.25 \mathrm{~g} \mathrm{~mL}^{-1}$, Molar mass...
JEE MainChemistryEasy
View Solution→
QJEE Main 20242024
Two open organ pipes of length 60 cm and 90 cm resonate at $6^{\text {th }}$ and $5^{\text {th }}$...
JEE MainPhysicsEasy
View Solution→
QJEE Main 20242024
Two coherent monochromatic light beams of intensities I and 4I are superimposed. The difference between maximum and minimum possible intensities...
JEE MainPhysicsEasy
View Solution→
QJEE Main 20242024
A wire of cross sectional area A, modulus of elasticity $2 \times 10^{11} \mathrm{Nm}^{-2}$ and length 2 m is stretched...
JEE MainPhysicsEasy
View Solution→
QJEE Main 20242024
In the given figure an ammeter A consists of a $240 \Omega$ coil connected in parallel to a $10 \Omega$...
JEE MainPhysicsEasy
View Solution→
QJEE Main 20242024
A coil having 100 turns, area of $5 \times 10^{-3} \mathrm{~m}^2$, carrying current of 1 mA is placed in uniform...
JEE MainPhysicsEasy
View Solution→
QJEE Main 20242024
Three balls of masses $2 \mathrm{~kg}, 4 \mathrm{~kg}$ and 6 kg respectively are arranged at centre of the edges of...
JEE MainPhysicsEasy
View Solution→
Check this project | Best Developer Portfolio