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Q.

When a mixture of $C u_{2} S$ and CuS is titrated with $A l {(M n O_{4})}_{3}$ in acidic medium the oxidation products of $C u_{2} S$ and CuS are $C u^{+ 2}$ and $S O_{2}$ if the molecular weight of $C u_{2} S$ ,CuS and $A l {(M n O_{4})}_{3}$ be $M_{1}, M_{2} a n d M_{3}$ respectively then which of the following statements are correct.

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a

Equivalent weight of $A l {(M n O_{4})}_{3}$ is $\frac{M_{3}}{15}$

b

Equivalent weight of CuS is $\frac{M_{2}}{5}$

c

Equivalent weight of $C u_{2} S$ is $\frac{M_{1}}{8}$

d

Equivalent weight of $A l {(M n O_{4})}_{3}$ is $\frac{M_{3}}{5}$

answer is A, D.

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Detailed Solution

detailed_solution_thumbnail

n factor for $C u_{2} S$ is 8

n factor for $C u S$ is 6

n factor for $A l {(M n O_{4})}_{3}$ is 15.

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When a mixture of Cu2S and CuS is titrated with Al(MnO4)3 in acidic medium the oxidation products of Cu2S and CuS are Cu+2 and SO2 if the molecular weight of Cu2S,CuS and Al(MnO4)3 be M1,M2 and M3 respectively then which of the following statements are correct.