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Question

When an aqueous solution of AgNO3 is electrolysed between platinum electrodes, the substances liberated at anode and cathode are:

A
Silver is deposited at cathode and O2 is liberated at anode
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B
Silver is deposited at cathode and H2 is liberated at anode
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C
Hydrogen is liberated at cathode and O2 is liberated at anode
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D
Silver is deposited at cathode and Pt is dissolved in electrolyte
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Solution

The correct option is B Silver is deposited at cathode and O2 is liberated at anode
At cathode:
The reaction with a higher value of E0 takes place at the cathode. Therefore, deposition of silver will take place at the cathode.
Ag+(aq)+eAg(s);E00.80V
At anode:
Since Pt electrodes are inert, the anode is not attacked by NO3- ions. Therefore, OH - or NO3- ions can be oxidized at the anode. But OH - ions having a lower discharge potential and get preference and decompose to liberate O2.
OHOH+e
4OH2H2O+O2

Hence option (A) is correct

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