The number of Faradays(F) required to produce `20g` of calcuim from molten `CaCl_2` (Atomic massof `Ca=40 gmol^-1`) is:

Options

A. 1
B. 2
C. 3
D. 4

Answer

A

Explanation

1 equivalent of any substance is deposited by 1F of charge. We have, 20 calcium g Number of equivalents `= ("Given mass")/("Equivalent mass") = (20)/(20)=1`
Equivalent mass of `Ca = (40)/(2)= 20`
So, 1 faraday of charge is required.