The number of Faradays required to produce one mole of water from hydrogen-oxygen fuel cell containing aqueous alkali as electrolyte is
Answer & explanation
Correct answer: option 3
The correct answer is option 3. 2.
At anode: \(H_2 (g) + 2OH^−(aq) \rightarrow 2H_2O (l) + 2e^−\)
At Cathode : \(O_2(g) + 2H_2O (l) + 4e^−\rightarrow 4OH^− (aq)\)
Overall: \(2H_2 (g) + O_2 (g) \rightarrow 2H_2O (l)\)
4F of charge is required to produce 2 moles of \(H_2O\).
Thus, 2 moles of charge is required to produce 1 mole of \(H_2O\).
Therefore, the number of Faraday required = 2F.
Therefore, the correct answer is (3) 2.