How will you separate the following mixtures?
(i) Oil and water
(ii) Iron-filings and saw dust.
(iii) Glass powder and sugar.

(i) Oil and water. As oil and water are usually immiscible with each other and form two separate layers, these layers can be separated with the help of separating funnel.
(ii) Iron-filings and saw dust. This mixutre can be separated by rolling a magnet into the mixture. Iron filings are attracted towards the magnet and stick to it leaving the saw dust behind.
(iii) Glass powder and sugar. The mixture is shaken with water in a beaker. Sugar dissolves in water whereas glass powder does not. The solution is filtered. Glass is left behind as residue while sugar solution is collected as filtrate. From the filtrate, sugar may be obtained by evaporation of water or by crystallisation process.