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

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A \(\left[ Ni ( CN )_4\right]^{2-}\) અને \(\left[ NiCl _4\right]^{2-}\) પ્રતિચુંબકીય છે અને \(Ni ( CO )_4\) અનુચુંબકીય છે.
B \(Ni ( CO )_4\) અને \(\left[ NiCl _4\right]^{2-}\) પ્રતિચુંબકીય છે અને \(\left[ Ni ( CN )_4\right]^{2-}\) અનુચુંબકીય છે.
C \(Ni ( CO )_4\) અને \(\left[ Ni ( CN )_4\right]^{2-}\) પ્રતિચુંબકીય છે અને \(\left[ NiCl _4\right]^{2-}\) અનુચુંબકીય છે.
D \(Ni ( CO )_4\) પ્રતિચુંબકીય છે અને \(\left[ NiCl _4\right]^{2-}\) અને \(\left[ Ni ( CN )_4\right]^{2-}\) અનુચુંબકીય છે.

Verified Solution

Answer & Solution

Correct Answer

(C) \(Ni ( CO )_4\) અને \(\left[ Ni ( CN )_4\right]^{2-}\) પ્રતિચુંબકીય છે અને \(\left[ NiCl _4\right]^{2-}\) અનુચુંબકીય છે.

Step-by-step Solution

Detailed explanation

\(\left[ Ni ( CN )_4\right]^{2-} \rightarrow 3 d^8 \rightarrow\) પ્રતિચુંબકીય \(\rightarrow dsp ^2\) \(\left[ Ni ( CO )_4\right] \rightarrow 3 d^{10} \rightarrow\) પ્રતિચુંબકીય \(\rightarrow sp ^3\)…

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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