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NCERT SOLUTION CLASS 9 CHAPTER 2 (IS MATTER AROUND US PURE )  PAGE NO. 24

QUESTION NO. 1 

          How will you separate a mixture containing kerosene and petrol ( difference between their boiling points is more than 25 C ), which are miscible with each other ?

ANSWER NO. 1

           Simple distillation can be done when the temperature difference between the boiling point of two miscible liquids is at least 25 C. The temperature difference  between the boiling points of petrol and kerosene in 25 C. So, this mixture can be separated using simple distillation.
          In this method, The mixture of kerosene and petrol is taken in a distillation flash with a thermometer fitted in it to monitor the temperature. Apart from this a beaker, a water condenser and a Bunsen burner is also required. The mixture is heated slowly. Temperature should be monitored constantly. Kerosene will vaporize and condense in the water condenser. The condensed kerosene is collected from the condenser outlet whereas petrol is remained in the distillation flask.

QUESTION NO. 2

Name the technique to separate 
(i) butter from curd,
(ii) salt from sea water, 
(iii) camphor from salt.

ANSWER NO. 2

(i) Butter is separated from the curd by using centrifugation method.
(ii) Salt is separated from sea water by the method of crystallization or by the             evaporation.
(iii) Camphor is separated from salt by sublimation technique.

QUESTION NO. 3

What type of mixtures are separated by the technique of crystallization ?

ANSWER NO. 3

Crystallisation is a process that separates a pure solid in the form of its crystals from a solution so it is used to separate a solid - liquid mixture.




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