Question

4. Protective action is performed by 'A' colloids for 'B'
colloids. Here A and B are respectively
(1) Lyophillic and lyophillic
(2) Lyophillic and lyophobic
(3) Lyophobic and lyophillic
(4) Lyophobic and lyophobic​

Answer 1

Answer:

1) Lyophillic and Lyophillic

Answer 2

Answer:

Protective action is performed by lyophilic colloids for lyophobic colloids.

Therefore, option (2) is correct.

Explanation:

A protective colloid is a lyophilic colloid. When a lyophilic colloid present in small quantities keeps lyophobic colloids from precipitating.

• Lyophilic colloids are more stable than lyophobic colloids.
• In Lyophilic colloids, colloidal particles are covered by the liquid in which they are dispersed because Lyophilic colloids are extensively solvated.

• Lyophilic colloids have ability of protecting lyophobic colloids. When a lyophilic colloid is added to the lyophobic colloid Then the lyophilic particles create a layer around lyophobic particles and protect the them from electrolytes.

Therefore, Lyophilic colloids also known as protective colloids.

• Lyophilic colloids:-Here, the dispersed phase shows a positive affinity for the dispersion medium (solvent) due to the formation of hydrogen bonds.
• Lyophobic colloids:- The dispersed phase does not have any affinity for the dispersion medium.

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