Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Consider the following electrochemical cell : 
The pH above which, oxygen gas would start to evolve at anode is 
(nearest integer).
standard reduction potential 
Text Solution
Verified by ExpertsThe correct answer is:
4
(4)
In this electrochemical cell, at the anode oxygen evolution occurs from water oxidation. Using Nernst equation for the 
couple: 
At the cathode: 
(standard potential for 
reduction)
For oxygen to start evolving, the cell potential becomes zero: 
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