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JAMB Chemistry 2023 Question 38

Question 38

Halogens

How is Cl2(g) prepared in the laboratory? by

  1. A.adding concentrated tetraoxosulphate (VI) acid to solid sodium chloride
  2. B.adding concentrated hydro chloric acid to solid manganese (IV) oxide
  3. C.dropping concentrated hydrochloric acid unto potassium tetraoxomanganate (VI) crystals and heating the mixture
  4. D.dropping concentrated hydrochloric acid unto potassium tetraoxomanganate(VI) crystals
Show the answer and explanation

Answer: D (dropping concentrated hydrochloric acid unto potassium tetraoxomanganate(VI) crystals)

Explanation

Concentrated HCl is oxidised to chlorine by potassium permanganate crystals without heating (option A gives HCl gas, not chlorine).