Transition and InnerTransition Elements - Result Question 160
####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, $MnO _4^{-}$is reduced to $MnO _2$ and $S _2 O _3^{2-}$ is oxidised to $SO _4^{2-}$.
Thus, $4 MnO _4^{-}+\frac{3}{2} S _2 O _3^{2-} \longrightarrow 3 SO _4^{2-}+4 MnO _2$ or $8 MnO _4^{-}+3 S _2 O _3^{2-} \longrightarrow 6 SO _4^{2-}+8 MnO _2$
Thus, moles of $SO _4^{2-}$ formed by 8 moles of $MnO _4^{-}=6$
