Multiple choice

Which of the following is not correctly matched?

  1. Galena : Lead sulphide

  2. Green vitriol : Copper sulphate

  3. Plaster of Paris : Calcium sulphate

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

Green vitriol is actually ferrous sulphate (FeSO4), not copper sulphate (CuSO4). Copper sulphate is called blue vitriol. The other options are correctly matched: Galena is lead sulphide (PbS), Plaster of Paris is calcium sulphate hemihydrate, and Calomel is mercurous chloride (Hg2Cl2).

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