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JEE Main 202227 JulyEvening Shift

Exam: JEE Main
Year: 2022
Date: 27 July
Shift: Evening Shift
Subject: Chemistry
Chapter: d and f Block Elements

JEE Main 2022 · 27 July · Evening Shift · Chemistry · d and f Block Elements

In neutral or alkaline solution, MnO _ 4 ^ - oxidises thiosulphate...

In neutral or alkaline solution,

{MnO}_{4}^{-}

oxidises thiosulphate to

Options

A ${S}_{2}{O}_{7}^{2 -}$
B ${S}_{2}{O}_{8}^{2 -}$
C ${SO}_{3}^{2 -}$
D ${SO}_{4}^{2 -}$

Correct answer

D. ${SO}_{4}^{2 -}$

Step-by-step solution

${KMnO}_{4}$ is a strong oxidising agent in acidic,alkaline or neutral medium as well
Thiosulphate is oxidised almost quantitatively to sulphate:
$8{MnO}_{4} + - 3{S}_{2}{O}_{3} + 2 - {H}_{2}O ⟶ 8{MnO}_{2} + 6{SO}_{4} + 2 - 2{OH}^{-}$
The equivalent weight of ${KMnO}_{4}$ in the above reaction = $\dfrac{158}{5}$

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