Among PbS, CuS, HgS, MnS, A g 2 S , NiS, CoS, B i 2 S 3 and S n S 2 , the total number of black coloured…

Among PbS, CuS, HgS, MnS, Ag2S , NiS, CoS, Bi2S3 and SnS2 , the total number of black coloured sulphides is

Solution

Black coloured sulphides {PbS,CuS, HgS,Ag2S, NiS,CoS}
* Bi2S3 in its crystalline form is dark brown but Bi2S3 precipitate obtained is black in colour.

Asked in: JEE Advanced 2014 (Paper 1)

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