E Θ values for the couples Cr 3+ /Cr 2+ and Mn 3+ /Mn 2+ ar…

Chemistry D and F - Block Elements Mix Single Correct MCQ

Published on: August 13, 2026

E Θ values for the couples Cr 3+ /Cr 2+ and Mn 3+ /Mn 2+ are – 0.41 and + 1.51 volts respectively. Considering these values select the correct option from the following statements.

Cr 2+ acts as a reducing agent and Mn 2+ acts as an oxidising agent in their aqueous solutions.

Cr 2+ (aq.) is more stable than Cr 3+ (aq.).

Mn 3+ (aq.) is more stable than Mn 2+ (aq).

None of these.

Text Solution

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The correct answer is:

Cr 3+ + e — — → Cr 2+ , E Θ = – 0.41 volts and Mn 3+ + e — — → Mn 2+ , E Θ = + 1.51 volts

This shows that Cr 2+ is unstable and has a tendency to acquire more stable Cr 3+ state by acting as a reducing agent. On the other hand Mn 3+ is unstable and is reduced to more stable Mn 2+ state.

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