AP EAMCET · Chemistry · Coordination Compounds

Which of the following outer octahedral complexes have same number of unpaired electrons?
1. \(\left[\mathrm{MnCl}_6\right]^{3-}\)
2. \(\left[\mathrm{FeF}_6\right]^{3-}\)
3. \(\left[\mathrm{CoF}_6\right]^{3-}\)
4. \(\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}\)

A 1 and 3
B 1 and 2
C 3 and 4
D 2 and 3

Verified Solution

Answer & Solution

Correct Answer

(A) 1 and 3

Step-by-step Solution

Detailed explanation

All four complexes given are outer orbital or high spin octahedral complexes. So, \(d\)-orbital electrons of central metal ions of the complexes remain unaffected by weak field ligands. So, \(d\)-configuration of free \(M^{n+}\) and coordinated \(M^{n+}\) will remain same. 1. 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.

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Which of the following outer octahedral complexes have same number of unpaired electrons?1. \(\left[\mathrm{MnCl}_6\right]^{3-}\)2. \(\left[\mathrm{FeF}_6\right]^{3-}\)3. \(\left[\mathrm{CoF}_6\right]^{3-}\)4. \(\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}\)

Step-by-step Solution

Which of the following outer octahedral complexes have same number of unpaired electrons?
1. \(\left[\mathrm{MnCl}_6\right]^{3-}\)
2. \(\left[\mathrm{FeF}_6\right]^{3-}\)
3. \(\left[\mathrm{CoF}_6\right]^{3-}\)
4. \(\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}\)