Some statement(s) about dry cell batteries are: (I). Electrolyte is a moist paste of NH 4 Cl and ZnCl 2. (II). Oxidation product is Zn 2+ and reduction product is Mn 2 O 3 (III). Anode is a zinc metal and cathode is inert graphite in a paste of MnO 2 and C -black Select the correct statement(s).

Question

Some statement(s) about dry cell batteries are: (I). Electrolyte is a moist paste of NH 4 Cl and ZnCl 2. (II). Oxidation product is Zn 2+ and reduction product is Mn 2 O 3 (III). Anode is a zinc metal and cathode is inert graphite in a paste of MnO 2 and C -black Select the correct statement(s). (A) I and II (B) I, II and III (C) III (D) II

Tardigrade Admin · Accepted Answer

In a dry-cell (also called leclanche cell) Anode Outer cover (cylindrical) is made of zinc. Oxidation takes place at anode.

Z n \to Z n^{2 +} + 2 e^{-}

Cathode Graphite (carbon) rod in a paste of

M n O_{2}

and carbon black. Electrolyte Paste of

N H_{4} Cl / Z n C l_{2}

(with starch binder) Reduction takes place.

2 M n O_{2} + 2 N H_{4}^{+} + 2 e^{-} ⟶ M n_{2} O_{3} + 2 N H_{3} + H_{2} O

Thus, I, II and III are correct.