1.

(a) How can a colloidal solution and a true solution of the same colour be distinguished from each other? (b) List four applications of adsorption.

Answer»

Solution :(a) The path of light becomes visible when passed through a colloidal solution while it is not visible in case of a true solution. This is because of Tyndall effect CAUSED by the scattering of light by colloidal particles.
(b) Applications of adsorption:
(i) Activated charcoal is used in gas masks to remove poisonous gases such as `CH_(4), CO,` etc.
(ii) Animal charcoal is used as decoloriser in the manufacture of sugar.
(iii) Silica is used for removing MOISTURE.
(iv) The ION exchange resins are used for removing hardness of water.


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