Assertion (A): The charge on one mole of electrons is one Faraday. Reason (R): The quantity of current…
Assertion (A): The charge on one mole of electrons is one Faraday.
Reason (R): The quantity of current required to deposit one mole of $\mathrm{Mg}$ from $\mathrm{Mg}^{2+}$ electrolyte solution is two Faradays.
The correct answer is
Both (A) and (R) are correct and (R) is the correct explanation of (A).
Both (A) and (R) are correct but (R) is not the correct explanation of (A).
(A) is correct but (R) is not correct.
(A) is not correct but (R) is correct.
Solution
The quantity of current required to deposit one mole of $\mathrm{Mg}$ from $\mathrm{Mg}^{2+}$ electrolyte solution is two Faradays.
$
\mathrm{Mg}^{2+}+2 e^{-} \longrightarrow \mathrm{Mg}
$
$\therefore$ Quantity of electricity required $=2 \mathrm{~F}$
Thus, two mole of electrons produce one mole of $\mathrm{Mg}$. It can be concluded that if $n, c=1 \mathrm{~mol}$ 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