Explanation:Solution:A liquid mixture that has solute particles dissolved in a solvent medium.The solute is the component that is present in less amount.The solvent is the component of the solution which is present in more quantities.Important Points Milk:It is a mixture of water, fat, and solids (in the form of milk protein and carbohydrates) that is mixed irrationally.Therefore milk is a mixture, not a pure substance.The main compounds of milk are lactose and casein.?Air:Air is a mixture of different gases and dust particles.Percentages-wise distribution of different gases is: Nitrogen - 78%, Oxygen - 21%, Argon - 0.9%, and the remaining portion is occupied by various other gases like carbon dioxide, neon, helium, sulfur dioxide, etc.Air also contains water vapour.Sugar:Sugar is a compound that is formed by a combination of three atoms: carbon, hydrogen, and oxygen.Since these three atoms are chemically joined with each other thus they form a compound in nature.Alloy:Alloy is a homogeneous mixture of two or more metals with non-metals.Alloy is a chemical compound with some metallic properties.Example- steel, brass, bronze etc.