Question

The quantity of charge required to obtain one mole of aluminium from $A{l}_2{O}_3$ is________.

• A. $1F$
• B. $6F$
• C. $3F$
• D. $2F$

Answer 1

Answer: (C)

$A{l}_2{O}_3\to 2Al$
$2A{l}^{3+}+6e^{-}\to 2Al$
$\therefore A{l}^{3+}+3e^{-}\to Al$
Thus, $3F$ of charge is required to obtain $1mole$ of $Al$ from $A{l}_2{O}_3$.