n-factors for $C u_{2} S$ and $C u S$ when they react with $K M n O_{4}$ in acidic medium are (neglecting the further oxidation of released $S O_{2}$ )

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7,7

6,6

8,6

6,8

answer is D.

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Detailed Solution

i) $\begin{matrix} C u_{2}^{2 +} \to 2 C u^{2 +} + 2 e^{-} (n = 2) \\ S^{- 2} \to S O_{2} + 6 e^{-} (n = 6) \end{matrix}] (n = 8)$
ii) $C u^{2 +}$ does not change only $S^{2 -}$ change to $S O_{2}$ hence n = 6

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