JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry

\(\left[\mathrm{NiCl}_4\right]^{2-}\) (અનુચુંબકીય) અને \(\left[\mathrm{Ni}(\mathrm{CO})_4\right]\) (પ્રતિચુંબકીય) ના ચુંબકીય વર્તણૂક પરથી, સાચી ભૂમિતિ અને ઑક્સિડેશન અવસ્થા પસંદ કરો.

A \(\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}^{\mathrm{II}}\), ચતુષ્ફલકીય
\(\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}^{\mathrm{II}}\), સમચોરસ સમતલીય
B \(\left[\mathrm{NiCl}_4\right]^{2-}\) : \(\mathrm{Ni}^{\mathrm{II}}\), સમચોરસ સમતલીય
\(\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)\), સમચોરસ સમતલીય
C \(\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}^{\mathrm{II}}\), ચતુષ્ફલકીય
\(\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)\), ચતુષ્ફલકીય
D \(\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}(0)\), ચતુષ્ફલકીય
\(\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)\), સમચોરસ સમતલીય

Verified Solution

Answer & Solution

Correct Answer

(C) \(\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}^{\mathrm{II}}\), ચતુષ્ફલકીય
\(\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)\), ચતુષ્ફલકીય

Step-by-step Solution

Detailed explanation

\(\left[\mathrm{NiCl}_4\right]^{2-}\) \(\mathrm{Ni}^{+2}-[\mathrm{Ar}] 3 \mathrm{~d}^8 4 \mathrm{~s}^0 \rightarrow \mathrm{sp}^3\), ચતુષ્ફલકીય અયુગ્મિત ઇલેક્ટ્રોનની સંખ્યા \(=2\) અનુચુંબકીય \(\left[\mathrm{Ni}(\mathrm{CO})_4\right]\)…

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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