TS EAMCET · Chemistry · d and f Block Elements

\(\mathrm{Cr}^{2+}\) and \(\mathrm{Mn}^{3+}\) do possess \(\mathrm{d}^4\) electronic configuration. So,

A \(\mathrm{Mn}^{3+}\) is oxidizing agent while \(\mathrm{Cr}^{2+}\) is reducing agent
B Both are reducing agents
C \(\mathrm{Mn}^{3+}\) is reducing agent while \(\mathrm{Cr}^{2+}\) is oxidizing agent
D Both are oxidizing agents

Verified Solution

Answer & Solution

Correct Answer

(A) \(\mathrm{Mn}^{3+}\) is oxidizing agent while \(\mathrm{Cr}^{2+}\) is reducing agent

Step-by-step Solution

Detailed explanation

\(\mathrm{Mn}\) is stable in +2 state so \(\mathrm{Mn}^{3+}\) acts as an oxidizing agent by getting reduced to \(\mathrm{Mn}^{2+}\) and attaining \(\mathrm{d}^5\) configuration. \(\mathrm{Cr}\) is stable in +3 state so \(\mathrm{Cr}^{2+}\) acts as a reducing agent by getting…

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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