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Q.

When a equimolar mixture of $C u_{2} S$ and CuS is titrated with Ba ${(M n O_{4})}_{2}$ in acidic medium. The final product contains $C u^{2 +}, S O_{2}, M n^{2 +}$ . If the Mwt of $C u_{2} S, C u S a n d B a {(M n O_{4})}_{2} a r e M_{1}, M_{2} a n d M_{3}$ respectively then

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a

$E q . w t o f C u_{2} S i s \frac{M_{1}}{8}$

b

$E q . w t o f C u s i s \frac{M_{2}}{6}$

c

$E q . w t o f B a {(M n O_{4})}_{2} i s \frac{M_{3}}{5}$

d

$C u_{2} S a n d C u S$

answer is A.

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Detailed Solution

$C u_{2} S \to C u^{2 +} + S O_{2}; M n O_{4}^{-} \to M n^{+ 2}$

$C u s \to C u^{2 +} S O_{2}$

$E q . w t o f C u_{2} S = \frac{M_{C u_{2} S}}{8}$

$E q . w t o f C u S = \frac{M}{6}$

$E q . w t o f B a {(M n O_{4})}_{2} = \frac{M}{10}$

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When a equimolar mixture of Cu2S and CuS is titrated with Ba (MnO4)2 in acidic medium. The final product contains Cu2+, SO2, Mn2+ . If the Mwt of Cu2S, CuS and Ba(MnO4)2 are M1, M2 and M3 respectively then