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JEE Advanced2014Chemistryd and f Block ElementsActual

Among PbS, CuS, HgS, MnS, A g 2 S , NiS, CoS, B i 2 S 3 and S n S 2 , the total number of black coloured sulphides is

Correct answer

6

Step-by-step solution

Black coloured sulphides P b S , C u S , H g S , A g 2 S , N i S , C o S * B i 2 S 3 in its crystalline form is dark brown but Bi 2 S 3 precipitate obtained is black in colour.

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