JEE Main 2022 · 29 Jul · Shift 1 · Chemistry Q70

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ChemistrySingle correct+4 / -1Question 70 of 90

In neutral or faintly alkaline medium, $\mathrm{KMnO_4}$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :

Answer and worked solution

Official answer: D

Manganese goes from +7 in $\mathrm{MnO_4^-}$ to +4 in $\mathrm{MnO_2}$ in neutral or faintly alkaline medium: change 3.

(D)

Topics:Important compounds (KMnO4, K2Cr2O7)Oxidation number

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JEE Main 2022 · 29 Jul · Shift 1, Chemistry question 70