Which of the following cell reactions is exhibited by fuel cell?

Options

A $\text{Cd}_{(s)} + 2\text{Ni(OH)}_{3(s)} \rightarrow \text{CdO}_{(s)} + 2\text{Ni(OH)}_{2(s)} + 2\text{H}_2\text{O}_{(l)}$
B $\text{Pb}_{(s)} + \text{PbO}_{2(s)} + 2\text{H}_2\text{SO}_{4(aq)} \rightarrow 2\text{PbSO}_{4(s)} + 2\text{H}_2\text{O}_{(l)}$
C $2\text{H}_{2(g)} + \text{O}_{2(g)} \rightarrow 2\text{H}_2\text{O}_{(l)}$
D $2\text{Fe}_{(s)} + \text{O}_2 + 4\text{H}^+ \rightarrow 2\text{Fe}^{2+}_{(aq)} + 2\text{H}_2\text{O}_{(l)}$

C. $2\text{H}_{2(g)} + \text{O}_{2(g)} \rightarrow 2\text{H}_2\text{O}_{(l)}$

The reaction

2\text{H}_{2(g)} + \text{O}_{2(g)} \rightarrow 2\text{H}_2\text{O}_{(l)}

represents the overall cell reaction of a hydrogen-oxygen fuel cell.

The reaction

\text{Cd}_{(s)} + 2\text{Ni(OH)}_{3(s)} \rightarrow \text{CdO}_{(s)} + 2\text{Ni(OH)}_{2(s)} + 2\text{H}_2\text{O}_{(l)}

occurs in a Nickel-Cadmium cell.

The reaction

\text{Pb}_{(s)} + \text{PbO}_{2(s)} + 2\text{H}_2\text{SO}_{4(aq)} \rightarrow 2\text{PbSO}_{4(s)} + 2\text{H}_2\text{O}_{(l)}

occurs in a lead storage battery.

The reaction

2\text{Fe}_{(s)} + \text{O}_2 + 4\text{H}^+ \rightarrow 2\text{Fe}^{2+}_{(aq)} + 2\text{H}_2\text{O}_{(l)}

represents the rusting of iron.

Answer:

2\text{H}_{2(g)} + \text{O}_{2(g)} \rightarrow 2\text{H}_2\text{O}_{(l)}