Q11 / 60 · JEE Advanced 2014 (Paper 1) · Chemistry

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

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 Bi₂S₃ precipitate obtained is black in colour.

Hence, the correct answer is 6.

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