The hydrogen/oxygen fuel cell keeps on working so long as

Options

A. the concentration of electrolyte in reduction half-cell reduces to zero
B. the concentration of electrolyte in oxidation half-cell reduces to zero
C. the concentration of electrolyte in reduction half-cell is equal to the concentration of electrolyte in oxidation half-cell
D. The supply of reactants continues

Answer

D

Explanation

Fuel cell continues to work so long as the supply of reactants continues.