Which of the following reactions is used to make a fuel cell ?

Options

A. `Cd(s)+2Ni(OH)_(3)(s)rarrCuO(s)+ 2Ni(OH)_(@)+H_(2)O(l)`
B. `Pb(s)+PbO_(2)(s)+ 2H_(2)SO_(4)(aq)rarr2PbSO_(4)(s)+2H_(2)O(l)`
C. `2H_(2)(g) +O_(2)(g)rarr2H_(2)O(l)`
D. `2Fe(s)+O_(2)(g)+4H^(+) (aq)rarr2Fe^(2+)(aq)+2H_(2)O(l)`

Answer

C

Explanation

Chemical reaction in a fuel cell is
`2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l)`