Question

Number of faradays of electricity required to liberate $12g$ of hydrogen is :

• A. $1$
• B. $8$
• C. $12$
• D. $16$

Answer 1

The correct option is C $12$

The molecular weight of hydrogen is 2 g/mol. 12 g of hydrogen $=\frac{12}{2}=6$ moles.

$H_2+2e^{-}\to 2H^{+}$

6 moles of hydrogen will require $6\times 2=12$ moles of electrons. This corresponds to 12 faradays of electricity.

The number of faradays of electricity required to liberate 12 g of hydrogen is 12.

Hence, option C is correct.