When an electric current is passed through acidified water, `112ml` of `H_(2)` gas at `NTP` is collected at the cathode is `965` seconds. The current passed in amperes is

Options

A. 1
B. 0.5
C. 0.1
D. 2

Explanation

(A) 22,400 mL of hydrogen at STP (or NTP)=2g
`:.112mL` of hydrogen at
`STP=(2gxx112mL)/(22,400mL)=10^(-2)g`
`:.2H^(+)+2e^(-)toH_2`
2F 1mol
`=2xx96,500C=2g`
2g hydrogen is deposited by `2xx96,500C`
`:.10^(-2)`g hydrogen will be deposited by
`=(2x96500xx10^(-2))/(2g)=965C`
Q`=ixxt965=ixx965i=1`