Some statements about Lechlanche cell are (I) Anode is zinc metal (II) Cathode is graphite rod surrounded by…
Some statements about Lechlanche cell are
(I) Anode is zinc metal
(II) Cathode is graphite rod surrounded by powdered $\mathrm{MnO}_2$ and carbon
(III)Electrolyte is a moist paste of $\mathrm{ZnO}$ and $\mathrm{KOH}$
(IV)Oxidation product is $\mathrm{ZnO}$
The correct statements are
I \& II only
II \& III only
I \& IV only
I, II \& III only
Solution
Lechlunche cell:-
Anode : $\mathrm{Zn}$ Container
$\mathrm{Zn}(\mathrm{s}) \rightarrow \mathrm{Zn}^{2+}$ (aq.) $+2 \mathrm{e}^{-}$
Cathode: Carbon (graphite) $+\mathrm{MnO}_2+$ Carbon powder.
$\mathrm{MnO}_2+\mathrm{NH}_4^{+}+\mathrm{e}^{-} \rightarrow \mathrm{MnO}(\mathrm{OH})+\mathrm{NH}_3$
Electrolyte $=\mathrm{NH}_4 \mathrm{Cl}+\mathrm{ZnCl}_2$ paste
Thus, I and II are correct.