Which of the followng reaction is used to make a fuel cell

Options

A. `Cd(s)+2Ni(OH)_(3)(s)rarrCd(s)+2Ni(OH)_(2)(s)+H_(2)O(l)`
B. `Pb(s)+PbO_(2)(s)+2H_(2)(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

D

Explanation

Cell which convert cehemical energy of a fuel directly into electricla energy is called fuel cell reaction taking place `H_(2) -O_(2)` fuel cell
`2H_(2) (g)+O_(2) (g) rarr 2H_(21)O(l)`