GUJCET · Chemistry · Coordination Compounds

Which statement is correct?

A \(\left[ NiCl _4\right]^{2-}\) is an inner orbital complex where as \(\left[ Ni ( CN )_4\right]^{2-}\) is an outer orbital complex.
B \(\left[ NiCl _4\right]^{2-}\) is an outer orbital complex where as \(\left[ Ni ( CN )_4\right]^{2-}\) is an inner orbital complex.
C \(\left[ NiCl _4\right]^{2-}\) and \(\left[ Ni ( CN )_4\right]^{2-}\) are inner orbital complexes.
D \(\left[ NiCl _4\right]^{2-}\) and \(\left[ Ni ( CN )_4\right]^{2-}\) are outer orbital complexes.

Verified Solution

Answer & Solution

Correct Answer

(B) \(\left[ NiCl _4\right]^{2-}\) is an outer orbital complex where as \(\left[ Ni ( CN )_4\right]^{2-}\) is an inner orbital complex.

Step-by-step Solution

Detailed explanation

\(\left[ NiCl _4\right]^{2-}\): \(Ni^{2+}\) (\(3d^8\)), \(Cl^-\) (weak field). No electron pairing \(\rightarrow sp^3\) hybridization \(\rightarrow\) outer orbital complex.

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.

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