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Question

If the H+ concentration is decreased from 1 M to 104 M at 25oC for the couple MnO4/Mn2+, then the oxidising power of the MnO4/Mn2+ couple decreases by :
  1. 0.18 V
  2. 0.18 V
  3. 0.38 V
  4. 0.38 V

A
0.18 V
B
0.38 V
C
0.18 V
D
0.38 V
Solution
Verified by Toppr

Initial
E1=Eo0.05915log[Mn2+](1)8
final
E2=Eo0.05915log[Mn2+](104)8E2E1=0.05915log[Mn2+]×(104)8[Mn2+]E=0.05915log1032=0.378(0.38V)
decreases by 0.378V
Reaction is MnO4+8H++5eMn2++4H2O

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If the H+ concentration is decreased from 1 M to 104 M at 25oC for the couple MnO4/Mn2+, then the oxidising power of the MnO4/Mn2+ couple decreases by :
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