JEE Main 2026 — Electrochemistry Question with Solution
JEE Main 2026 (22 January Shift 2)
Question
Consider the following electrochemical cell : The pH above which, oxygen gas would start to evolve at anode is (nearest integer).
standard reduction potential
standard reduction potential
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Show full solutionCorrect answer: 4
Correct answer
4
Step-by-step explanation
In this electrochemical cell, at the anode oxygen evolution occurs from water oxidation. Using Nernst equation for the O₂/H₂O couple:
At the cathode: V (standard potential for M²⁺/M reduction)
For oxygen to start evolving, the cell potential becomes zero:
At the cathode: V (standard potential for M²⁺/M reduction)
For oxygen to start evolving, the cell potential becomes zero:
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This is a previous-year question from JEE Main 2026, covering the Electrochemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.