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

  • A the salt can be obtained by crystallization
  • B the salt can be recovered by the evaporation of water
  • C heat is not generated during mixing
  • D the solution will not boil at 100oC
jamb 1993chemistry

The correct answer is B. the salt can be recovered by the evaporation of water

The evaporation of water is a physical change. When water evaporates, it changes from the liquid state to the gas state, but it is still water; it has not changed into any other substance.

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