Question

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

A
6
B
7
C
8
D
9
Solution
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The total number of black colored sulfides is 6. These include PbS,CuS,HgS,NiS,CoS,Bi2S3.
Bi2S3 in its crystalline form is dark brown but Bi2S3 precipitate obtained is black in color.

Hence, the correct option is A

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