Question

The number of Faradays(F) required to produce 20g of calcium from molten $CaCl_2$ (Atomic mass of $CaCl_2$ g $mol^{-1}$) is :

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (A)

1

Answer 2

$Ca^{+2}+2e^{-}\to Ca$
$2F$ of electricity deposits 1 mole of Ca $(40\,g)$
To deposite 20 g of Ca, the number of Faraday required =1