Home Chemistry D and F - Block Elements General E Θ values for the couples Cr3+/Cr2+ and Mn3…
Chemistry D and F - Block Elements General Single Correct MCQ
Published on: August 14, 2026

E Θ values for the couples Cr3+/Cr2+ and Mn3+/Mn2+ are – 0.41 and + 1.51 volts respectively. Considering these values select the correct option from the following statements

A
Cr2+ acts as a reducing agent and Mn3+ acts as an oxidising agent in their aqueous solutions.
B
Cr2+ (aq.) is more stable than Cr3+ (aq.).
C
Mn3+ (aq.) is more stable than Mn2+ (aq).
D
None of these

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Verified by Experts
The correct answer is:
A

Electron configuration of Mn is [Ar]18 3d5 4s2 and thus it contains five unpaired electrons. Hence it can show the highest oxidation state equal to + 7.

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