What is the total number of black coloured sulphides among Ag2S, Bi2S3, CoS, CuS, HgS, MnS, NiS, PbS, and SnS2.

(A) Two

(B) Four

(C) Six

(D) Eight

The Correct Answer is (C) Six

Solution:

The total number of black coloured sulphides is 6. These include Ag2S, Bi2S3, CoS, CuS, HgS, and PbS.

  • Silver sulphide (Ag2S) — It is greyish-black in colour
  • Bismuth(III) sulphide (Bi2S3) — It is dark brown in colour. In its crystalline form is dark brown but the Bi2S3 precipitate obtained is black in colour.
  • Cobalt sulphide (CoS) — It is black in colour
  • Copper monosulphide (CuS) — It is black in colour
  • Mercury sulphide (HgS) — It is found in red and black in colour. Crystals of red are optically active, while black coloured crystals are less common in nature.
  • Manganese(II) sulphide (MnS) — It is found in red, green, brown and pink in colour.
  • Nickel sulphide (OCS) — It is colourless sulphides
  • Lead(II) sulphide (PbS) — It is black in colour
  • Tin(IV) sulphide (SnS2) — It is gold-yellow in colour

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