Question

A suspension of liquid droplets or fine solid particles in a gas is called :

• A. aerosol
• B. emulsion
• C. foam
• D. colloid

Answer 1

The correct option is A aerosol

A suspension of liquid droplets or fine solid particles in a gas is called an aerosol or particulate. In the atmosphere, these consist of fine dust and soot particles, fog, clouds, etc.

An emulsion is a type of colloid in which liquid is dispersed into another liquid medium. For example, milk, face cream, etc.

Foam is also a type of colloid in which gas is dispersed into a liquid medium. For example, rubber, pumice, sponge, etc.

A colloid is a mixture of two or more substances mixed together which does not chemically react with each other.

Hence, option $A$ is correct.