Question

Assertion (A): The charge on one mole of electrons is one Faraday.
Reason ( R ): The quantity of current required to deposit one mole of $Mg$ from $Mg ^{2+}$ electrolyte solution is two Faradays. The correct answer is

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. Both ( A ) and ( R ) are correct but ( R ) is not the correct explanation of (A).
• C. ( A ) is correct but ( R ) is not correct.
• D. (A) is not correct but (R) is correct.

Answer 1

Answer: (A)

The quantity of current required to deposit one mole of $Mg$ from $Mg ^{2+}$ electrolyte solution is two Faradays.

$Mg ^{2+}+2 e^{-} \longrightarrow Mg$

$\therefore $ Quantity of electricity required $=2 \,F$

Thus, two mole of electrons produce one mole of $Mg$. It can be concluded that if $n, c= 1 \,mol$ electrons are involved in the electrod reaction, the passage of $n$ Faradays of electricity will liberate one mole of the substance, i.e. the charge on one mole of electrons is one Faraday.