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Q.

H2S is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:

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a

reduction of Cu2+

b

double decomposition

c

oxidation of Cu2+

d

reduction and oxidation

answer is C.

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Detailed Solution

It is an example of double displacement reaction in which, sulphide ion displaces sulphate ion and combines with copper.

CuSO4 + H2S ⟶ CuS↓ + H2SO4

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H2S is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to: