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Among PbS, CuS, HgS, MnS, `Ag_(2)S`, NiS, CoS, `Bi_(2)S_(3)` and `SnS_(2)`, total number of black coloured sulphides is :
A. Four
B. Six
C. Five
D. Three

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Correct Answer - B
`PbS, CuS, HgS, Ag_(2)S, NiS` and CoS are black coloured.

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