Q28 / 199 · NTA Abhyas (NEET) 2020 · Chemistry · Electrochemistry

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

  • Correct answer
    A
    1/2 hour
  • B
    1 hour
  • C
    2 hours
  • D
    5 hours

Solution

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
2H++2e-2F→H21mol
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

Hence, the correct answer is option: 'A'.

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