Multiple choice general knowledge

Which of the following is not correctly matched?

  1. Galena: Lead sulphide

  2. Green vitriol: Copper sulphate

  3. Plaster of Path: Calcium sulphate

  4. Calomel : Mercurous chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Green vitriol is ferrous sulphate (FeSO4·7H2O), not copper sulphate. Copper sulphate is blue vitriol. Galena correctly matches with lead sulphide (PbS), Plaster of Paris with calcium sulphate (CaSO4·½H2O), and Calomel with mercurous chloride (Hg2Cl2).

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