Transition and InnerTransition Elements - Result Question 60
60. In neutral or faintly alkaline solution, 8 moles of permanganate anion quantitative oxidise thiosulphate anions to produce $X$ moles of a sulphur containing product. The magnitude of $X$ is …….
(2016 Adv.)
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Answer:
Correct Answer: 60. (6)
Solution: In neutral or faintly alkaline solution, $\mathrm{MnO}_4^{-}$is reduced to $\mathrm{MnO}_2$ and $\mathrm{S}_2 \mathrm{O}_3^{2-}$ is oxidised to $\mathrm{SO}_4^{2-}$.
Thus, $4 \mathrm{MnO}_4^{-}+\frac{3}{2} \mathrm{~S}_2 \mathrm{O}_3^{2-} \longrightarrow 3 \mathrm{SO}_4^{2-}+4 \mathrm{MnO}_2$
or $8 \mathrm{MnO}_4^{-}+3 \mathrm{~S}_2 \mathrm{O}_3^{2-} \longrightarrow 6 \mathrm{SO}_4^{2-}+8 \mathrm{MnO}_2$
Thus, moles of $\mathrm{SO}_4^{2-}$ formed by 8 moles of $\mathrm{MnO}_4^{-}=6$
BETA
