Which substance is an example of a colloid milk , tomato juice, sand and water, sugar and water?

Option (a) is the correct answer.

Explanation:

A solution in which particles are dispersed and remain suspended is known as a colloid.

For example, milk is a colloid.

Whereas in a suspension, particles tend to settle at the bottom of the solution due to their large size.

For example, tomato juice is a suspension.

A solution in which solute particles are unevenly distributed throughout the solution is known as a heterogeneous mixture.

For example, sand and water is a heterogeneous mixture.

A solution is which solute particles are evenly distributed throughout the solution is known as a homogeneous solution.

For example, sugar and water is a homogeneous solution.

Therefore, we can conclude that out of the given options milk is an example of a colloid.

the answer is b. dilution