AP EAMCET · Chemistry · Coordination Compounds

Which of the following complexes formed by Nickel is tetrahedral and paramagnetic?

A ${[Ni (CN)_{4}]}^{2 -}$
B $[Ni (CO)_{4}]$
C ${[Ni (Cl)_{4}]}^{2 -}$
D ${[Ni {({NH}_{3})}_{6}]}^{2 +}$

Verified Solution

Answer & Solution

Correct Answer

(C) ${[Ni (Cl)_{4}]}^{2 -}$

Step-by-step Solution

Detailed explanation

According to the spectrochemical series, the cyanide and carbonyl ligands are the strong field ligands and chloride is a weak field ligand. The nickel with the six ligands formed the octahedral compounds. Nickel with four ligands formed the square planar and tetrahedral…

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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