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CGP EDU Academic Team
Published on: August 14, 2026
The standard oxidation potentials for Mn 3+ ion acid solution are Mn 2+ 
Mn 3+ 
MnO 2 . Is the reaction 2 Mn 3+ + 2 H 2 O ⎯→ Mn 2+ + MnO 2 + 4H + spontaneous under conditions of unit activity ? What is the change in free energy ?
Text Solution
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Spontaneous, − 48250 J
Sol. Mn 3+ + e – ⎯→ Mn 2+ 1.5 volt
Mn 3+ ⎯→ MnO 2 + e – – 1 volt
2H 2 O + Mn 3+ ⎯→ MnO 2 + 4H + + e – .
2Mn 3+ + 2H 2 O ⎯→ MnO 2 + 4H + + Mn 2+ .
2Mn 3+ ⎯→ Mn 2+ + MnO 2 , Eº = 1.5 – 1 = 0.5 volt.
Δ G = –1 × 0.5 × 96500 = – 48.25 KJ.
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