(a) What is a mixture? Give two examples of mixtures.​(b) What is meant by (i) homogenous mixtures, and (ii) heterogeneous mixtures? Give two examples of homogeneous mixtures and two of heterogeneous mixtures.

(a) Mixtures are substances that contain two or more different kinds of particles or substances mixed together by physical methods.

Examples: Air, brick

(b)(i) Mixtures in which the constituting substances are mixed together completely and are indistinguishable from one another are called homogeneous mixtures. Such mixtures have a homogeneous composition of their substances throughout the solution. 

Examples: Sugar solution, salt solution

(ii) Mixtures in which the constituting substances remain separated and one substance is spread throughout the other substance as small particles, droplets or bubbles is known as heterogeneous mixtures.

Examples: Starch solution, soap solution