Question

(a) Define sublimation and sedimentation.
(b) You are provided with a mixture of ammonium chloride, common salt, sand and iron filings. Which of these substances can be separated by sublimation and which by sedimentation ?
(c) Can salt be separated by sedimentation ? Justify your answer.

CBSE Class IX Science LA (5 Marks)

Answer 1

(a) Sublimation is a process in which a solid is directly converted into vapour state on heating and vice versa. Sedimentation is a process of settling down of solid particles at the bottom in a mixture of solid and liquid.

(b) Ammonium chloride by sublimation, sand and iron filings by sedimentation.

No, because the common salt dissolves in water.