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

Milk is an example of colloid.

Explanation: There are three types of solutions:

True solutions: These solutions are homogeneous mixtures, in which there is no physical boundary present between the solute and solvent.Colloids: These solutions are also homogeneous mixtures which have an intermediate particle size and do not have a physical boundary in between the solute and solvent.Suspension: These solutions are considered as heterogeneous mixtures in which physical boundary is present in between the solute and solvent particles. The solute particles settle down after some time.

From the given options:

Milk is a colloid.Tomato juice is a type of suspension.Sand and water are also a type of suspension.Sugar and water is an example of true solution.

Milk. It is a liquid butter fat dispersed within a water based solution. 

Hno3(aq) → h+(aq) + no3−(aq). picture ii best represents the strong acid hno3. strong acids are strong electrolytes