Question

Which of the following is a lyophilic colloid?

• A. Milk
• B. Gum
• C. Fog
• D. Blood

Hint:

Lyophilic colloids are characterized by their affinity for the dispersion medium, typically water. Examples include milk and blood.

Answer 1

The Correct Option is A

Step 1: Understanding lyophilic colloids.
Lyophilic colloids are those that have an affinity for the dispersion medium (usually water) and are easily hydrated. These colloids are stable in the medium, unlike lyophobic colloids that are unstable and tend to aggregate. Step 2: Analysis of options.
(A) Milk: Milk is a typical example of a lyophilic colloid as it is a water-based system, with fat dispersed in water.
(B) Gum: Gum is a colloid that is not necessarily lyophilic, as it can be more stable in certain conditions without water affinity.
(C) Fog: Fog is a lyophobic colloid, as it consists of liquid droplets dispersed in air.
(D) Blood: Blood is a complex colloidal mixture but is not classified as a typical lyophilic colloid.
Step 3: Conclusion.
The correct answer is (A) because milk is a lyophilic colloid.