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When H2S is passed through acidified CuS...

When `H_2S` is passed through acidified `CuSO_4` solution, a black precipitate is formed due to

A

Oxidation of `Cu^2+`

B

Reduction of `Cu^2+`

C

Reduction and oxidation of `Cu^2+`

D

Neither reduction or oxidation of `Cu^2+`

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