JEE Main 2024 — Electrochemistry Question with Solution
From: JEE Main 2024 (Online) 5th April Morning Shift
Question
The reaction at cathode in the cells commonly used in clocks involves.
Choose an option
Show full solutionCorrect option: B
Step-by-step explanation
In the cells commonly used in clocks, specifically alkaline batteries, the reaction at the cathode involves the reduction of manganese dioxide (MnO2). The manganese in MnO2 is initially in the +4 oxidation state, and it gets reduced to the +3 oxidation state. Thus, the correct reaction occurring at the cathode can be represented as follows:
The correct answer is:
Option B
reduction of from +4 to +3
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This is a previous-year question from JEE Main 2024, 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.