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  • \text {KMnO}_{4} acts as an oxidising agent in acidic medium. The number of moles of \text {KMnO}_{4} that will be needed to react with one mole of sulphide ions in acidic solution is (i) frac{2}{5} (ii) frac{3}{5} (iii) frac{4}{5} (iv) frac{1}{5}

\text {KMnO}_{4} acts as an oxidising agent in acidic medium. The number of moles of \text {KMnO}_{4} that will be needed to react with one mole of sulphide ions in acidic solution is

(i) \frac{2}{5}

(ii) \frac{3}{5}

(iii) \frac{4}{5}

(iv) \frac{1}{5}

Answers (1)

The answer is the option (i). 

\text {2MnO}_{4}^{-}+\text {5S}^{2-}+\text {16H}^{+}\rightarrow \text {2Mn}^{2+}+\text {5S}+\text {8H}_{2}\text {O}

For 5 moles of S the number of moles of  \text {KMnO}_{4}=2

For 1 mole of S the number of moles of \text {KMnO}_{4}=\frac{2}{5}

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