1
JEE Main 2026 (Online) 28th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct statement among the following is:

A

$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ and $\left[\mathrm{NiCl}_4\right]^{2-}$ are diamagnetic and $\mathrm{Ni}(\mathrm{CO})_4$ is paramagnetic.

B

$\mathrm{Ni}(\mathrm{CO})_4$ is diamagnetic and $\left[\mathrm{NiCl}_4\right]^{2-}$ and $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ are paramagnetic.

C

$\mathrm{Ni}(\mathrm{CO})_4$ and $\left[\mathrm{NiCl}_4\right]^{2-}$ are diamagnetic and $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ is paramagnetic.

D

$\mathrm{Ni}(\mathrm{CO})_4$ and $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ are diamagnetic and $\left[\mathrm{NiCl}_4\right]^{2-}$ is paramagnetic.

2
JEE Main 2026 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$ \text { The wavelength of light absorbed for the following complexes are in the order } $$

JEE Main 2026 (Online) 24th January Evening Shift Chemistry - Coordination Compounds Question 20 English
A

III $<$ IV $<$ I $<$ II $<$ V

B

III $<$ I $<$ IV $<$ V $<$ II

C

III $<$ I $<$ IV $<$ II $<$ V

D

III $<$ I $<$ II $<$ IV $<$ V

3
JEE Main 2026 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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 and 4.9 BM respectively.

Statement II : Geometry, hybridisation and spin only magnetic moment values $(B M)$ of the ions $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-},\left[\mathrm{MnBr}_4\right]^{2-}$ and $\left[\mathrm{CoF}_6\right]^{3-}$ respectively are square planar, tetrahedral, octahedral; $\mathrm{dsp}^2, \mathrm{sp}^3, \mathrm{sp}^3 \mathrm{~d}^2$ and $0,5.9,4.9$.

In the light of the above statements, choose the correct answer from the options given below

A

Both Statement I and Statement II are false

B

Statement I is true but Statement II is false

C

Both Statement I and Statement II are true

D

Statement I is false but Statement II is true

4
JEE Main 2026 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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 .

Statement II :

$\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]<\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]<\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{SO}_4 \cdot \mathrm{H}_2 \mathrm{O}<\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3$ is the correct order in terms of number of unpaired electron(s) present in the complexes.

In the light of the above statements, choose the correct answer from the options given below

A

Statement I is true but Statement II is false

B

Both Statement I and Statement II are false

C

Statement I is false but Statement II is true

D

Both Statement I and Statement II are true

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