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Q.

Which method can be used to separate a mixture of sand and ammonium chloride?

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a

Sublimation

b

Centrifugation

c

Distillation

d

Fractional Distillation


 

answer is A.

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Detailed Solution

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  • When a solid substance directly changes its state from solid to gaseous on heating without going through the liquid phase, then this process is known as sublimation. The substance that can undergo sublimation is called sublimate.
  • Examples are naphthalene, camphor, ammonium chloride, benzoic acid, and iodine.
  • Since in the mixture of sand and ammonium chloride, ammonium chloride is a sublimate, they can be separated by the method of sublimation. 
  • Ammonium chloride sublimes after some heating leaving behind the sand.
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