Electrochemistry

Question

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

Accepted Answer

Option B. 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:

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Electrochemistry

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