Ncert Exercises & Solutions

$K M n O_{4}$ acts as an oxidizing agent in an acidic medium. The number of moles of $K M n O_{4}$ that will be needed to react with one mole of sulphide ions in an acidic solution is $:$

1.	$\dfrac{2}{5}$	2.	$\dfrac{3}{5}$
3.	$\dfrac{4}{5}$	4.	$\dfrac{1}{5}$

The reaction is as follows:

$5 \mathrm{~S}^{2-}+2 \mathrm{MnO}_4^{-}+16 \mathrm{H}^{+} \longrightarrow 2 \mathrm{Mn}^{2+}+8 \mathrm{H}_2 \mathrm{O}+5 \mathrm{~S}$

5 moles of S^2- ions react with 2 moles of KMnO₄ . So, 1 mole of S^2- ion will react with $\frac{2}{5}$ moles of KMnO₄

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1.	\(\dfrac{2}{5}\)	2.	\(\dfrac{3}{5}\)
3.	\(\dfrac{4}{5}\)	4.	\(\dfrac{1}{5}\)