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JAMB Chemistry 1982 Question 18

Question 18

Separation of Mixtures

Which of the following processes does NOT lead to a chemical change?

  1. A.Stiring iron in sulphur (IV) acid.
  2. B.Stiring sodium carbonate in water.
  3. C.Stiring glucose in concentrated sulphur (IV) acid
  4. D.Mixing sulphur (VI) acid with potassium carbonate
  5. E.Titrating an acid against base
Show the answer and explanation

Answer: B (Stiring sodium carbonate in water.)

Explanation

Sodium carbonate simply dissolves in water, a physical change. Each of the other processes is a reaction (with an acid, dehydration, or neutralisation).