Question

The number of Faradays (F) required to produce $20\text{g}$of calcium from molten${\mathrm{CaCl}}_2$ is:

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is A

$1$

The explanation for the correct option

(A)$1$

Step1. According to the question:-

${\text{Ca}}^{2+}{\text{+2e}}^{-}\text{→Ca}$

Step2. Calculation of electricity required to produce $40\text{g}$

• Electricity required to produce $40\text{g}$=$2\text{F}$
• Electricity required to produce $20\text{g}$of Calcium from molten ${\mathrm{CaCl}}_2$=$\frac{2\text{F}\times 20\text{g}}{40\text{g}}=1\text{F}$

The explanation for the incorrect option

The number of Faradays (F) required to produce $20\text{g}$of Calcium from molten${\mathrm{CaCl}}_2$ is $1$. Hence, the options (B), (C), and (D) are incorrect.

Hence, option (A) is correct. The number of Faradays (F) required to produce $20\text{g}$of calcium from molten ${\mathrm{CaCl}}_2$ is $1$.