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Q.

How many of the following are black coloured compounds Ag2S PbS ,HgS, CuS , FeS , CoS ,NiS , ZnS , CdS , Sb2S3 MnS

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answer is 7.

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Detailed Solution

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Ag2S,  PbS, HgS, CuS, FeS, CoS, NiS

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