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Question

Which of the following statements is/are true for the electrolysis of aq.LiCl with Ag electrodes?

A
Ag is deposited at cathode
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B

Ag get dissolved to give Ag+ at anode

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C
O2 is liberated at anode
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D
Cl2 is liberated at anode
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Solution

The correct option is B

Ag get dissolved to give Ag+ at anode


When the electrolysis of aq.LiCl is done with Ag electrodes, there are three possible reaction to occur at both anode and cathode.
Here, the silver electrode used is a active electrode. It is involved in the cell reaction.
At cathode:
1. Li+(aq)+eLi(s)
E0Li+/Li=3.04 V

2. 2H2O(l)+2eH2(g)+2OH(aq)
E0H2O/H2=0.83 V

3. Ag+(aq)+eAg(s)E0Ag+/Ag=0.80 V

The reaction with a higher reduction value of E0 takes place at the cathode. Therefore, deposition of silver will take place at the cathode.
At cathode : Ag+(aq)+eAg(s)

At anode:
1. 2Cl(aq)Cl2(g)+2e
E0Cl/Cl2=1.36 V

2. 2H2O(l)4H+(aq)+O2(g)+4e
E0H2O/O2=1.23 V

3. Ag(s)Ag+(aq)+e
E0Ag/Ag+=0.8 V

The reaction with a higher oxidation value of E0 takes place at the anode. Therefore, silver is dissolved at anode.
At anode: Ag(s)Ag+(aq)+e

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