EVERYDAY SCIENCE

Detailed explanation-1: -Sugar solution is a mixture and made up of different kinds of molecules. So it is not a pure substance.

Detailed explanation-2: -Milk is a colloidal solution. It is an emulsion of milk fat in water. Milk comprises fat which is in the form of ester and carbohydrates as sugar. Therefore milk is not a pure substance.

Detailed explanation-3: -Heterogeneous mixtures are not pure substances. Examples of materials that are not pure substances include gravel, your computer, a mixture of salt and sugar, and a tree.

Detailed explanation-4: -Milk is a mixture of water, milk, protein, and fat. it can be split into two or more different substances. Hence, milk is not a pure substance.