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

Options

A. ` Cd(s) + 2 Ni (OH)_3 (s) rarr CedO(s) = 2 Ni (OH) +H_2O(l)`
B. `Pb(s) + PbO_2(s) + 2H_2SO_4(aq) rarr 2PbSO_4 (s) +2H_2O(l)`
C. ` 2H_2(g) +O_2(g) rarr 2H_2O(l)`
D. `2Fe(s) + O_2 (g) + 4 H^+) rarr 2Fe^(2+) (aq) +2 H_2 O(l)`

Answer

C

Explanation

Overall reaction : `1- 2 H-2 (g) + O_2 (g) rarr 2 H_2 O (l)`.