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In a typical fuel cell, the reactant (R) and product (P) are
A
R = $H_{2(g)}\cdot N_{2(g)}$ : P = $NH_{3(aq)}$
B
R = $H_{2(g)}\cdot O_{2(g)}$ : P = $H_2O_{2(l)}$
C
R = $H_{2(g)}\cdot O_{2(g)}$ : P = $H_2O_{(l)}$
D
R = $H_{2(g)}\cdot O_{2(g)}\cdot Cl_{2(g)}$ : P = $HClO_{4(aq)}$
Detailed Solution
In a typical (hydrogen-oxygen) fuel cell, the reactants are $H_2(g)$ and $O_2(g)$, which combine to give water, $H_2O(l)$, as the product, along with electrical energy.