An electrolytic cell is constructed for preparing hydrogen. For an average current of 2 ampere in the circuit, the time required to produce 450 mL of hydrogen at NTP is approximately

Question

An electrolytic cell is constructed for preparing hydrogen. For an average current of 2 ampere in the circuit, the time required to produce 450 mL of hydrogen at NTP is approximately, 1/2 hour, 1 hour, 2 hours, 5 hours

MARKS App · Accepted Answer

22400 mL H 2 at STP = 1 mol H 2 So 450 ml H 2 at STP = 450 mL 22400 mL ×1 mol H 2 = 0.02 mol Electrode reaction 2 H + + 2 e - 2 F → H 2 1 m o l The liberation of 1 mol H 2 requires = 2 × 96500 C So the liberation of 0 .02 mol H 2 requires = 2 × 96500 × 0.02 C = 3860 C Time required to produce 0 .02 mol H 2 , t = Q i = 3860 2A = 1930 s ≃ 0 .503 hour ≈ 0.5 hour

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