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Q.

Among PbS,CuS,HgS,MnS,Ag2S,NiS,CoS,Bi2S3, and SnS2 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,Bi2S3. 

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

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