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JAMB Chemistry 1993 Question 1

Question 1

Separation of Mixtures

The dissolution of common salt in water is a physical change because

  1. A.the salt can be obtained by crystallization
  2. B.the salt can be recovered by the evaporation of the water
  3. C.heat is not generated during mixing
  4. D.the solution will not boil at 100°C
Show the answer and explanation

Answer: B (the salt can be recovered by the evaporation of the water)

Explanation

A physical change produces no new substance and is easily reversed. Evaporating the water gives back the same salt, so dissolving salt is a physical change.