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. `2.0`

Answer

A

Explanation

Moles of hydrogen gas `=(112 xx 10^(-3))/22.4 = 5 xx 10^(-3)`
1 mole of hydrogen ion requires = 96500 coulomb `2 xx 5 xx 10^(-3)` mole of hydrogen ion requires `=2 xx 5 xx 10^(-3) xx 96500` coulomb
I = Q/t
`= (2 xx 5 xx 10^(-3) xx 96500)/965`
= 1 amp