In a hydrogen -oxygen fuel cell, combustion of hydrogen occurs to

Options

A. Produce high purity water
B. Create potential difference between the two electrodes
C. Generate heat
D. Remove adsorbed oxygen from electrode surfaces

Answer

B

Explanation

In hydrogen oxygen fuel cell, the following reactions create potential difference between the two electrodes.
Anode: `2H_(2) (g) + 4OH^(-) (aq) rarr 4H_(2)O (l) + 4e^(-)`
Cathode: `ul(O_(2)(g) + 2H_(2)O (l) + 4e^(-) rarr 4OH^(-) (aq))`
Over all reaction: `2H_(2)(g) + O_(2)(g) rarr 2H_(2)O(l)`
The net reaction is the same as burning (combustion) of hydrogen to form water.