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

The total number of unpaired electrons present in the \(d^3\), \(d^4\) (low spin), \(d^5\) (high spin), \(d^6\) (high spin) and \(d^7\) (low spin) octahedral complex systems is _______.

A 15
B 25
C 35
D 45

Verified Solution

Answer & Solution

Correct Answer

(A) 15

Step-by-step Solution

Detailed explanation

In an octahedral complex, the d-orbitals split into \(t_{2g}\) and \(e_g\) levels. For \(d^3\): Configuration is \(t_{2g}^3 e_g^0\). Number of unpaired electrons = \(3\). For \(d^4\) (low spin): Configuration is \(t_{2g}^4 e_g^0\). Number of unpaired electrons = \(2\). For…

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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