Question

In hydrogen-oxygen fuel cell the carbon rods are immersed in hot aqueous solution of ...
a)KCL B)KOH c) H2SO4 d) NH4CL

Answer 1

Answer: B) KOH

Explanation: Hydrogen Oxygen fuel cell consists of porous carbon electrodes containing finely divided platinum as catalyst. Concentrated KOH is used as the electrolyte. Hydrogen and Oxygen are bubbled through porous electrodes into the KOH solution.

The following electrode reactions take place:

At anode: Oxidation takes place: $H_2(g)+4OH^-(aq)\rightarrow 4H_2O+4e^-$

At cathode: Reduction takes place: $O_2(g)+2H_2O(l)+4e^-\rightarrow 4OH^-(aq)$