The electrochemical equivalent of a metal is `3.35109^(-7)` kg per Coulomb. The mass of the metal liberated at the cathode when a 3A current is passed for 2 seconds will be

Options

A. `6.6 xx 10^(57) kg `
B. `9.9 xx 10^(-7) kg`
C. `19.8 xx 10^(-7) kg`
D. `1.1 xx 10^(-7) kg`

Answer

C

Explanation

(c) The mass liberated m, electrochemical equivalent of a metal Z, are related as
`m = Zit`
`rArr m = 3.3 xx 10^(-7) xx 3xx 2 = 19.8 xx 10^(-7) kg. `