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Cu(2)S+MnO(4)^(ө)rarrCu^(2+)+Mn^(2+)+SO(...

`Cu_(2)S+MnO_(4)^(ө)rarrCu^(2+)+Mn^(2+)+SO_(2)`
The equivalent weight of `Cu_(2)`S is

A

`(M)/(2)`

B

`(M)/(6)`

C

`(M)/(8)`

D

`(M)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
C
Both `Cu^(1+)` and `S^(2-)` in `Cu_(2)S` undergo oxidation.
`Cu_(2)^(+1xx2)rarr2Cu^(2+)+2e^(-)(x=2)`(oxidation)
`2x=2, 2x=4`
`S^(2-)rarrSO_(2)+6e^(-)(x=6)`(oxidation)
`x= -2 , x-4=0`
`x=4`
Total `e^(-)= 8`
`Ew=(M)/(8)`
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