Question

Dry cell has a small life time because of the corrosion of Zn container to form .

• A. $N{H}_4^{+}\left(aq\right)$
• B. $C{l}^{-}ions$
• C. $M{n}_2{O}_3\left(s\right)$
• D. $\left[Zn\right(N{H}_3{)}_4]C{l}_2$

Answer 1

The correct option is D $\left[Zn\right(N{H}_3{)}_4]C{l}_2$

Dry cells reactions

• At anode

$Zn\left(s\right)⟶Z{n}^{2+}\left(aq\right)+2e^{-}$

• At cathode

$Mn{O}_2\left(s\right)+2N{H}_{4}Cl+2e^{-}⟶M{n}_2{O}_3\left(s\right)+2N{H}_3+H_{2}O\left(l\right)$

• Overall reaction

$Zn\left(s\right)+Mn{O}_2\left(s\right)+2N{H}_{4}Cl⟶Z{n}^{2+}\left(aq\right)+M{n}_2{O}_3\left(s\right)+2N{H}_3+H_{2}O\left(l\right)$
Zinc and ammonia react to form the complex given in the answer.