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Concentration Terms

Among PbS, ...

Question

Among $P b S, C u S, H g S, M n S, A g_{2} S, N i S, C o S, B i_{2} S_{3}$ and SnS $_{2}$ , the total number of black coloured sulphides are:

A

6

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B

7

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C

8

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D

9

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Solution

The correct option is D 6
The total number of black colored sulfides is 6. These include $P b S, C u S, H g S, N i S, C o S, B i_{2} S_{3}$ .
$B i_{2} S_{3}$ in its crystalline form is dark brown but $B i_{2} S_{3}$ precipitate obtained is black in color.

Hence, the correct option is A

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