An electrolytic cell is constructed for preparing hudrogen. For an averge current of `1` amper in the circuit , the time required to produce `450 mL` of hydrogen at `NTP` is appr.

Options

A. ` 30` min
B. `1` hour
C. ` 2` hours
D. ` 5` hours

Answer

B

Explanation

` 22, ml H_2 at STP + 1 mol H_2`
`:. 450 mL H_2 at STP= ( 450 mL)/(22. 400mL) xx 1 "mole" H_@`
`= 0.02` mol
Electrode reaction :
` 2H^+ +2E^(-_ rarrH_2`
`2 F 1 mli`
So, the liberation of `0.02` mole of `H_2` required
`=2 xx 96, 500 xx 0.02 C = 3860 C`
Time required to produce `0.2` mole
`H_2 = Q/I = ( 3. 860)/(1 A) = 1.07 ~~1` hour .