Q9 / 90 · JEE Main 2022 (27 Jul Shift 2) · Chemistry

In neutral or alkaline solution, ${MnO}_{4}^{-}$ oxidises thiosulphate to

A
$S_{2} O_{7}^{2 -}$
B
$S_{2} O_{8}^{2 -}$
C
${SO}_{3}^{2 -}$
Correct answer
D
${SO}_{4}^{2 -}$

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 = $\frac{158}{5}$

Hence, the correct answer is option: 'D'.

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In neutral or alkaline solution, MnO4- oxidises thiosulphate to

Solution

Relevant Questions

In neutral or alkaline solution, ${MnO}_{4}^{-}$ oxidises thiosulphate to