Describe any three properties of colloids. Categorise the following examples of colloids into different categories of colloids : Jelly, fog, milk, shaving cream.
Q. Describe any three properties of colloids. Categorise the following examples of colloids into different categories of colloids : Jelly, fog, milk, shaving cream.
Ans. Properties of colloids:
(a) A colloid is a heterogeneous mixture. The size of particles of a colloid is too small to be individually seens by naked eyes.
(b) Colloids are big enough to scatter a beam of light passing through it and make as the path of light visible.
(c) They do not settle down when left undisturbed, i.e., a colloid is quite stable. However, centrifugation technique can be used to separate the colloidal particles.
> Jelly: Gel, Fog: Aerosol, Milk: Emulsion, Shaving cream : Foam.
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