Qualitative Analysis - Result Question 45

####48. Among PbS, CuS, $HgS, MnS, Ag _2 S, NiS, CoS, Bi _2 S _3$ and $SnS _2$ the total number of black coloured sulphides is

(2014 Adv.)

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Answer:

Correct Answer: 48. (6 or 7)

Solution:

  1. From qualitative analysis of the different metal ions it is found that $PbS, CuS, HgS, Ag _2 S, NiS, CoS$ are black coloured.

$MnS$ - dirty pink/buff coloured, $SnS _2$ - yellow coloured.

$Bi _2 S _3$ - brown/black (brownish black) coloured.

Hence, correct integer is (6 or 7).



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