Question

(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 1

1. 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. 

2. Applications of adsorption: 

• Activated charcoal is used in gas masks to remove poisonous gases such as CH₄ , CO, etc. 
• Animal charcoal is used as decoloriser in the manufacture of sugar. 
• Silica is used for removing moisture.
• The ion exchange resins are used for removing hardness of water.