CUET · CHEMISTRY · PYQ PAPER 2025

Choose the incorrect statement from the following:

A permanganate ion is tetrahedral
B pi-bonding in permanganate ion takes place by overlap of p orbital of oxygen with d orbital of manganese
C permanganate ion is paramagnetic in nature
D permanganate ion is purple in colour

Verified Solution

Answer & Solution

Correct Answer

(C) permanganate ion is paramagnetic in nature

Step-by-step Solution

Detailed explanation

Oxidation state of Mn in \(\text{MnO}_4^-\) is +7. Electronic configuration of \(\text{Mn}^{7+}\) is \([\text{Ar}] 3\text{d}^0\). No unpaired electrons \(\implies\) diamagnetic. Therefore, the incorrect statement is "permanganate ion is paramagnetic in nature".

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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