(a) A colloid is a heterogeneous mixture and its components can be separated by the technique known as centrifugation.
Heterogenous mixture: It is the mixture which in not uniform in composition.
Centrifugation: It is a separation technique which uses the concept of centrifugal force to settle the particles at the bottom of the container.
(b) Ice, water and water vapour look different and display different physical properties but they are chemically the same.
Ice, water and vapour all the forms of water but are physically different. Because, ice is a solid, water is liquid and vapour is gas.

(c) A mixture of chloroform and water is taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of water and the lower layer will be that of chloroform.
It is because water is lighter than chloroform. Chloroform consists of chlorines molecules that are denser than water molecules and it make the chloroform nearly 50% heavier than water.
(d) A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called fractional distillation.
(e) When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the scattering of light by milk and the phenomenon is called Tyndall effect. This indicates that milk is a colloidal solution.
Colloidal Solution: A colloidal solution is also known as suspension. It is a solution in which a material is evenly suspended in a liquid