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Q.

Which of the following metal ions give black precipitate with H2S/NH4OH?

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a

Ni2+

b

Cd2+

c

Co2+

d

Pb2+

answer is A, C, D.

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Detailed Solution

NiS, PbS, CoS – Black;          CdS – Yellow
With Group-IV reagent both Group-II and IV cations give precipitate.

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