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Question

In acidic medium Cr2O27 is an oxidising agent
Cr2O27+14H++6e2Cr+3+7H2O
[ECr2O27/Cr+3=1.33V]
The electrode potential of half cell at pH = 1 keeping concentration of other species unity is:

A
2.1574V
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B
0.5026V
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C
1.1921V
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D
1.4679V
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Solution

The correct option is C 1.1921V
Cr2O27+14H++6e2Cr+3+7H2O
Given pH=1=log[H+]
Thus, [H+]=101
Using Nernst Equation we have
Ecell=Eocell0.05916log[Cr+3]2[Cr2O27][H+]14
Ecell=1.330.05916log[1]2[1][101]14
Ecell=1.330.0591×146
Ecell=1.1921V .

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