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Question

The mixture of sand and camphor is purified by:


A

Separating funnel

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B

Distillation

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C

Cooling

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D

Sublimation

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Solution

The correct option is D

Sublimation


Explanation for correct answer:

Option D Sublimation

  • Sublimation is the process where the compound changes from solid to vapours directly.
  • In the mixture of sand and camphor, both the components are present in a solid state,
  • While heating, sand does not change its state but camphor on heating changes to vapour, and sand is left behind.
  • Therefore, the mixture of sand and camphor can be purified by sublimation.
  • Hence option (D) Sublimation is correct.

Explanation for incorrect answer:

Option A Separating funnel

  • A separating funnel is used to separate mixtures of the liquid components with different densities.
  • Since two mixtures are immiscible, when it is poured into the separating funnel they would form two different layers.
  • The solvent with high density will be the bottom layer and the solvent with low density will be the upper layer in the separating funnel.
  • The knob of the separating funnel is then opened and the two layers are collected separately in different beakers.
  • Hence option (A) separating funnel is incorrect

Option B Distillation

  • Distillation is used to separate a mixture of liquid components with different boiling points.
  • The liquid with a low boiling point will evaporate first and then condense and get collected in a separate beaker.
  • Hence option (B) Distillation is incorrect

Option C Cooling

  • Cooling is not a separation technique.
  • Hence option (C) Cooling is incorrect

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