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Question

On electrolysis using platinum electrodes dilute nitric acid yields:

A
hydrogen at cathode
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B
oxygen at anode
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C
both A and B
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D
oxygen at cathode and hydrogen at anode
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Solution

The correct option is C both A and B
In dilute HNO3,
Oxidation potential of OH > oxidation potential of NO3.
OH oxidises to O2 at anode in the following way:
4OH2H2O+O2+4e
H+ reduces to H2 at cathode in the following way:
2H++2eH2

Option C is correct.

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