Question

The number of Faradays (F) required to produce $20g$ of calcium from molten $CaC{l}_2$ is :
$\text{Atomic mass of Ca}=40gmo{l}^{–1}$

• A. 3
• B. 4
• C. 1
• D. 2

Answer 1

The correct option is C 1

$w=ZQZ=\frac{E}{F}$
$\text{here w is the mass deposited}$
$\text{here Z is the electrochemical equivalent}$
$\text{here E is the equivalent weight of the substance dposited}$
$\text{here Q is the charge required}$
$\Rightarrow Q=\frac{w}{Z}Q=\frac{20}{\frac{20}{F}}Q=1F$