Some Basic Concepts of Chemistry - Result Question 19

Answer:

Correct Answer: 19. (a)

Solution:

The balanced chemical reaction is :

$2 \mathrm{MnO}_4^{-}+5 \mathrm{SO}_3^{2-}+6 \mathrm{H}^{+} \longrightarrow 2 \mathrm{Mn}^{2+}+5 \mathrm{SO}_4^{2-}+3 \mathrm{H}_2 \mathrm{O}$

$\because 5$ moles $\mathrm{SO}_3^{2-}$ reacts with 2 moles of $\mathrm{KMnO}_4$

$\therefore 1$ mole of $\mathrm{SO}_3^{2-}$ will react with $\frac{2}{5}$ mole $\mathrm{KMnO}_4$.