Question

Question 1 How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?

Class 9 - Science - Is Matter Around Us Pure Page 24

Answer 1

Heya !

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>> If the difference in the boiling points of two miscible liquids is 25°C (or more), their mix can be separated by the process of simple distillation. In case, the difference in the boiling points of two miscible liquids, kerosene and petrol, 25°C, therefore, a mixture containing kerosene and petrol can be separated by the process of simple distillation. This can be done as follows : The mixture of kerosene and petrol is taken in a distillation flask fitted with a thermometer and a water condenser. On heating the distillation flask with a burner, the petrol having lower boiling point distils over first and collected in a suitable container. Kerosene having higher boiling point distils over later and collected in another container ( Caution : Petrol is highly inflammable. It catches fire easily).


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Answer 2

To separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), Fractional distillation method is used.