JEE Main 2022 · 27 Jul · Shift 2 · Chemistry Q69

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ChemistrySingle correct+4 / -1Question 69 of 90

In neutral or alkaline solution, $\mathrm{MnO_4^-}$ oxidises thiosulphate to :

\mathrm{S_2O_7^{2-}}

\mathrm{S_2O_8^{2-}}

\mathrm{SO_3^{2-}}

\mathrm{SO_4^{2-}}

Answer and worked solution

Official answer: D

Neutral or alkaline $\mathrm{MnO_4^-}$ oxidises thiosulphate to sulphate: $\mathrm{8MnO_4^-+3S_2O_3^{2-}+H_2O\rightarrow8MnO_2+6SO_4^{2-}+2OH^-}$ .

(D)

Topics:Important compounds (KMnO4, K2Cr2O7)Balancing redox reactions

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JEE Main 2022 · 27 Jul · Shift 2, Chemistry question 69