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Question

Salt can be separated from its solution (salt dissolved in water), because:


A

(a) Mixing of salt in water is a change that can be reversed by heating and melting of salt.

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B

Mixing of salt in water is a change that cannot be reversed.

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C

Mixing of salt in water is a permanent change.

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D

Mixing of salt in water is a change that can be reversed by evaporation.

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Solution

The correct option is D

Mixing of salt in water is a change that can be reversed by evaporation.


Explanation for correct option:

Option D

Evaporation:

  • Salt can be separated from its solution because the mixing of salt in water is a change that can be reversed by evaporation.
  • Evaporation is the process of changing a liquid into its vapor state by the action of heat.
  • The process of evaporation can be made faster by heating.
  • The process of evaporation is used on a large scale to obtain common salt from seawater.
  • Sea water is trapped in shallow ponds and allowed to evaporate in the sun.
  • Mixing of salt in water is a reversible change.

Reversible changes:

  • Any changes which can be reversed or are a temporary conversion are known as reversible changes.
  • Processes such as melting, boiling, evaporation, freezing, condensation, dissolution are reversible changes.
  • For example, melting of wax, freezing of ice, boiling water which evaporates as steam and condenses back to the water.

Therefore, option D is correct.


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