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Standard XII
Chemistry
Redox Reactions and Couple
Question

From the following half-cell reaction and their potential, What is the smallest possible standard e.m.f spontaneous reaction?
PO3−4(aq)+2H2O(I)+2e−⟶HPO23+3OH−(aq);Eo=−1.05V
PbO2(s)+H2O(I)+2e−⟶PbO(S)+2OH−(aq);Eo=+0.28V
IO−3(aq)+2H2O(I)+4e−⟶IO−(aq)+4OH−(aq);Eo=+0.56V
  1. +0.00
  2. +0.74
  3. +0.56
  4. +0.28

A
+0.28
B
+0.00
C
+0.74
D
+0.56
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