Question

State one Appropriate observation....
(iii) CuS is treated with Dil HCI​

Answer 1

Answer:

CuS + HCl → CuCl2 + H2S

 explanation-  When a few drops of dil. HCl is added to silver nitrate solution, followed by addition of NH 4 OH solution, a curdy white precipitate of silver chloride is formed which is soluble in ammonium hydroxide. The chemical equation for this reaction is as follows:

CuS + HCl → CuCl2 + H2S 3.

Answer 2

Aɴsᴡᴇʀ-

The black coloured copper sulphite turns blue and hydrogen sulphide gas is liberated.

CuS + dil.HCl → CuCl2 + H2S.

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