Question

Which of the following characteristic is true with respect to colloids?

• A. They always have two phases.
• B. The dispersion medium is always in a liquid state.
• C. They are homogeneous.
• D. The components can be separated by filtration.

Answer 1

The correct option is A They always have two phases.

A colloid has two phases - dispersion medium and dispersed phase. Each of the two phases of a colloid can be solid, liquid, or a gas. Even though colloids appears to be homogeneous, it is a heterogenous mixture. Also the particles are smaller than that of suspension, so cannot be seperated by filtration.