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Question

Electrolysis of dilute and aqueous NaCl is carried out using Pt electrodes. As the electrolysis progresses:

A
pH increases
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B
pH decreases
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C
pH first decreases and then increases
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D
pH remains constant
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Solution

The correct option is D pH remains constant
Electrolysis of dilute NaCl (aq) carried out using inert electrodes:

Since ,
E0H2O/H2>E0Na+/Na

Reaction at cathode:
2H2O(l)+2eH2(g)+2OH(aq)

Reaction at anode: If concentration of Cl is low, oxidation of H2O to give O2 is favoured.

2H2O(l)4H+(aq)+O2(g)+4e

For the same number of electrons transferred, both H+ and OH ions produced, neutralise each other.
Hence pH remains constant during electrolysis of dilute NaCl (aq) using inert electrode.

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