Question

Which substance is reduced at cathode when dry cell is working?

(A) ZnCl2 (B) Zn

(C) MnO2 (D) NH4Cl​

Answer 1

Zinc-carbon cells

The substances in the cell that leak out are corrosive to metal and can terminally destroy electronic equipment or flashlights. Zinc-carbon cells produce 1.5 volts. For a dry-cell battery to operate, oxidation will occur from the zinc anode and reduction will take place in the cathode.

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Answer 2

The substance reduced at cathode when a dry cell is working is (C) MnO2

• Manganese dioxide contained in dry cells increases the cell's efficiency by absorbing the hydrogen gas released by the cell.
• In a dry cell the Manganese dioxide(Mno2) is reduced to Manganese(III) oxide ( Mn2O3).
• It further serves as a depolariser. It creates moisture and moisturises the solution that boosts ion mobility and makes the solution much quicker.