Question

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to :
A. remove adsorbed oxygen from electrode surfaces
B. create potential difference between the two electrodes
C. produce high purity water
D. generate heat

Answer 1

Correct Answer - B
`{:(2H_(2)+4OH_((aq.))^(-)rarr4H_(2)O_((l))+4e),(O_(2(g))+2H_(2)O_((l))+4erarr4OH_((aq.))^(-)):}/(2H_(2)+O_(2(g))rarr2H_(2)O_(l),E_(cell)^(@)=+ve)`
Fuel cell involves direct conversion of chemical energy to electrical energy.