CBSE Class 6 Answered

Keep this mixture in a beaker and leave the beaker aside for some time. The sand settles down at the bottom and it can be separated by filtration. The filtrate contains salt and water. Transfer this liquid to a kettle and close its lid. Heat the kettle for some time. Steam comes out from the spout of the kettle. Take a metal plate with some ice on it. Hold the plate just above the spout of the kettle. When the steam comes in contact with the metal plate cooled with ice, it condenses and forms liquid water.

After all the water has evaporated, salt is left behind in the kettle. By this way, we can separate a mixture of salt, sand and water using processes of decantation, filtration, evaporation and condensation.

A mixture of kerosene and petrol cannot be separated by decantation because they are miscible liquids and decantation process cannot be used for separating miscible liquids.