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Q.

Among $PbS, CuS, HgS, MnS, {Ag}_{2} S, NiS, CoS, {Bi}_{2} S_{3}$ , and ${SnS}_{2}$ the total number of BLACK coloured sulphides is:

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answer is 6.

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Detailed Solution

BLACK coloured sulphides are,

$PbS, CuS, HgS, NiS, CoS, {Bi}_{2} S_{3} .$

The total number of these sulphides is 6. Thus, the correct answer is 6.

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