Question

The number of moles of $KMn{O}_4$ that will be needed to react with one mole of sulphite ion in acidic solution is :

• A. $\frac{2}{5}$
• B. $\frac{3}{5}$
• C. $\frac{4}{5}$
• D. 1

Answer 1

The correct option is A $\frac{2}{5}$

$2Mn{O}_4^{-}+5S{O}_3^{2-}+6H^{+}\to 2M{n}^{2+}+5SO{4}^{2-}+3H_{2}O$
So, according to the reaction, number of moles of $KMn{O}_4$ that will be needed to react with one mole of sulphite ion in acidic solution is $\frac{2}{5}$.