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  (i) You are given a mixture of sand, water and mustard oil. How will you separate the components of this mixture. Explain it with the help of different separation methods involved in it. (ii) Give flow diagram showing the process of obtaining gases from air.

Answer:

                  Mixture of naphthalene and sodium chloride is separated by the process of sublimation as naphthalene is a sublimate but sodium chloride does not. For separating the mixture, take it in a china dish over which an inverted funnel is placed and stem of the funnel is closed with cotton.                                           (2) Set the apparatus as shown in the figure below. Now heat the mixture,   naphthalene being a sublimate sublimes and when its vapours reach at the funnel they get condensed there to give solid naphthalene. Sodium chloride remain as residue in the china dish.             (1)