If, in an ammonical solution, salts which produce a black precipate wh – InterviewSolution

1.	If, in an ammonical solution, salts which produce a black precipate when H_2S is passed through themselves, may be :
Answer» A nickel salt A mercury salt A cobalt salt A LEAD saltc Solution :AMMONICAL `H_2S` soution can precipitate IV group RADICALS

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