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What is the final oxidation state of manganese after the electrochemical reactions in a dry cell?

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in Chemistry – Class 12 by (188k points)
What is the final oxidation state of manganese after the electrochemical reactions in a dry cell?

(a) +4

(b) +3

(c) +2

(d) +1

This question was addressed to me at a job interview.

My doubt stems from Electrochemistry in section Electrochemistry of Chemistry – Class 12

1 Answer

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Best answer
Right choice is (b) +3

The best explanation: In a dry cell, in the cathode reaction, manganese dioxide(MnO2) is reduced to form manganese oxide-hydroxide(MnO(OH)). In this process, the oxidation state of manganese changes from +4 to +3. Hence the final oxidation state of manganese is +3.

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