CUET · CHEMISTRY · PYQ PAPER 2023

Answer the question on basis of passage given below :
Transition metals form a large number of complexes or coordination compounds in which the metal atoms are bound to a number of anions or neutral molecules. The valence bond theory explain the formation, magnetic behaviour and geometrical shapes while the crystal field theory explains the effect of different crystal fields on the degeneracy of d-orbitals energies of the central metal atom/ion. This provides for the quantitative estimation of orbital separation energies, magnetic moments and spectral and stability parameters.
Amongst the following ions which should have the highest magnetic moment value?

A \(\left[ NiCl _4\right]^{2-}\)
B \(\left[ Mn ( CN )_6\right]^{4-}\)
C \(\left[ Cr \left( NH _3\right)_6\right]^{3+}\)
D \(\left[ CoF _6\right]^{3-}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(\left[ CoF _6\right]^{3-}\)

Step-by-step Solution

Detailed explanation

\( \left[ NiCl _4\right]^{2-} \): \( Ni^{2+} \Rightarrow 3d^8 \). \( Cl^- \) is weak field. \( n=2 \). \( \mu = \sqrt{2(2+2)} = \sqrt{8} \) \( \left[ Mn ( CN )_6\right]^{4-} \): \( Mn^{2+} \Rightarrow 3d^5 \). \( CN^- \) is strong field. \( n=1 \).…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From CUET

Match the items of List - I and List - II

List - I (Item)	List - II (Definition/Term)
(A) Instantaneous Rate	(I) rate constant
(B) Average Rate	(II) rate law
(C) Mathematical expression for rate of reaction in terms of concentration of reactants	(III) Short interval of time
(D) Rate of reaction for zero order reaction is equal to	(IV) long direction of time

Choose the correct answer from the options given below:

CUET 2023 Hard

A student was fascinated with the beautiful mauve colored flowers of water hyacinth, he asked his teacher to allow him to take a few plants to his village pond, but teacher denied him to do so because:

CUET 2025 Medium

Explore more questions on app

List-I	List-II
(A) \(l=m=n=\)	(I) 10
(B) \(k+l+m+n=\)	(II) 6
(C) \(k^2+l^2+(m-n)^2\)	(III) 2
(D) \(l^2+m^2+(n-k)=\)	(IV) 20