Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Given below are the half-cell reactions :
Mn 2+ + 2e – ⎯→ Mn ; Eº = –1.18 V
2(Mn 3+ + e – ⎯→ Mn 2+ ) ; Eº = +1.51 V
The Eº for 3Mn 2+ ⎯→ Mn + 2Mn 3+ will be :
Text Solution
Verified by ExpertsThe correct answer is:
A
Mn 2+ 
Mn
∴ for Mn 2+ disproportionation, E 0 = – 1.51 V –1.18 V
= – 2.69 V < 0
Reaction is non-spontaneous.
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