The reduction potential of a 0.01M hydrogen electrode is:
A
0.059V
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B
−0.059V
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C
−0.118V
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D
0.118V
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Solution
The correct option is C−0.118V At hydrogen electrode, H++e−⟶12H2. Ecell=E∘cell−0.059zlog1[H+] Ecell=E∘cell−0.0591log1[H+] Ecell=0−0.059×log(10)2 Ecell=−2×0.059V Ecell=−0.118V