Separation of Substances

Which process of separation requires wind ?

• Threshing

• Sieving

• Hand Picking

• Winnowing

In what cases we find the method of Handpicking convenient?

• When there is less quantity of impurities

• When we need to separate only rice and stones

• When the size of impurities are big

• When there is only a small quantity and impurities of small size

Which method of Separation is used to separate sand from sawdust?

• Hand picking

• Winnowing

• Sieving

• Filtration

Sedimentation is the process of :-

• allowing the impurities to settle down

• adding chlorine to the water

• taking out impurities from water using the hand

• by which we add impurities to water

What can be separated by Sieving?

• Stones from grains

• Husk from wheat

• Small impurities from water

• Grains from stalks

We filter impurities using a :-

• Windmill

• Spoon

• Bullock cart

• Filter paper

What is a Saturated Solution ?

• When the solute settles down at the bottom

• When no more solute can be added to the solvent and settles at the bottom

• When soluble substances do not dissolve in water

• A Salt Solution

How do we separate salt from water?

• Condensation

• Filtration

• Distillation

• Evaporation

How to make Butter from milk?

• Churning

• Stirring

• Freezing

• Adding oil and Freezing

How can we obtain salt from sea water?

• By filtration

• By evaporation

• By condensation

• By decantation