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JEE Main 20245 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
5 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Electrochemistry

JEE Main 2024 · 5 April · Morning Shift · Chemistry · Electrochemistry

The reaction at cathode in the cells commonly used in clocks...

The reaction at cathode in the cells commonly used in clocks involves.

Options

  1. Areduction of (\mathrm{Mn}) from +7 to +2
  2. Breduction of (\mathrm{Mn}) from +4 to +3
  3. Coxidation of (\mathrm{Mn}) from +3 to +4
  4. Doxidation of (\mathrm{Mn}) from +2 to +7

Correct answer

B. reduction of (\mathrm{Mn}) from +4 to +3

Step-by-step solution

In the cathode reaction manganese (Mn)(\mathrm{Mn}) is reduced from the +4 oxidation state to the +3 state.
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