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Question

Which of the following(s) is/are true for electrolysis of dilute LiOH solution using platinum electrodes?

A
H2 is evolved at cathode
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B
H2 is evolved at anode
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C
Li metal is obtained at cathode
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D
O2 is produced at anode
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Solution

The correct option is D O2 is produced at anode
On electrolysis of aqueous LiOH solution, H+ is reduce to H2 and gets liberated at cathode.

Li+(aq)+eLi(s)
E0Li+/Li=3.04 V

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

This is because of the higher reduction potential of H+ than Li+.
Cell reaction:

At cathode: 2H2O(l)+2eH2(g)+2OH(aq)
At anode: 2H2O(l)4H+(aq)+O2(g)+4e
E0H2O/O2=1.23 V

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