Which of the following reaction is reaction is used to make a fuel cell .

Options

A. `Cd_((s))+2Ni(OH)_(3(s))toCdO_((s))+2Ni(OH)+H_(2)O_((l))`
B. `Pb_((s))+PbO_(2(s))+2H_(2)SO_(4(aq))to2PbSO_(4(s))+2H_(2)O_((l))`
C. `2H_(2(g))+O_(2(g))to2H_(2)O_((l))`
D. `2Fe_((s))+O_(2(g))+4H_((aq))^(+)to2Fe_((aq))^(2+)+2H_(2)O_((l))`

Answer

C

Explanation

Overall reaction `-2H_(2(g))+O_(2(g))to2H_(2)O_((l))`