Q. Which of the following reactions is used to make a fuel cell?
A) $2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)$
B) $2Fe(s) + O_{2}(g) + 4H^{+}(aq) \rightarrow 2{Fe}^{2 +}(aq) + 2H_{2}O(l)$
C) $Pb(s) + {PbO}_{2}(s) + 2H_{2}{SO}_{4}(aq) \rightarrow 2{PbSO}_{4}(s) + H_{2}O(l)$
D) $Cd(s) + 2Ni(OH)_{3}(s) \rightarrow CdO(s) + 2Ni(OH)_{2} + 2H_{2}O(l)$
Explanation
The correct answer is Option A: $2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.