How will you separate the following mixtures?
(a) Sulphur, potassium nitrate and charcoal
(b) Sand, common salt, iron filings and naphthalene
(c) Powdered glass, ammonium chloride and potassium chloride.

Explanation

(a) (i) sulphur is soluble in carbon disulphide
(ii) Potassium nitrate is soluble in water
(iii) Charcoal is insoluble in carbon disulphide as well as in water.

(b) (i) Iron filings are separated by a magnet
(ii) Naphthalene sublimes on heating
(iii) Sand is insoluble in water.

(c) (i) Ammonium chloride sublimes on heating
(ii) Potassium chloride is soluble in water
(iii) Powdered glass is insoluble in water.