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Is Matter Around Us Pure ? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure ?1 Mark
MCQ
To separate ammonium chloride from common salt, we use:
  • A
    Filtration
  • B
    Sedimentation
  • C
    Sieving
  • D
    Sublimation
✓

Answer

  1. Sublimation

Explanation:

Sublimation is a method in which a solid substance directly changes to the gas phase without changing into the liquid phase. 

Ammonium chloride is separated from common salt(sodium chloride) by sublimation.

This happens because ammonium chloride is volatile in nature whereas common salt is non-volatile in nature. 

Hence when a mixture of ammonium chloride and common salt is heated, ammonium chloride changes its state from solid to vapour.

The vapours of ammonium chloride are then condensed on a cold surface.

The common salt(sodium chloride) is left behind.

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