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Q.

When an equimolar mixture of Cu2S and CuS is titrated with Ba(MnO4)2 in acidic  medium, the final product contain Cu2+,SO2 and Mn2+. If the molecular weight of Cu2S,CuSandBa(MnO4)2   are M1,M2andM3 respectively, then

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a

Equivalent weight of  Cu2S is M18

b

Equivalent weight of  CuS is M26

c

Equivalent weight of  Ba(MnO4) is M35

d

Cu2S and CuS  both have same equivalent weight

answer is A, B.

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Detailed Solution

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n – factor of  Cu2S=8
n – factor of CuS = 6
n – factor of  Ba(MnO4)2=10

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