Out of a colloid, solution and a suspension:

(a) which one has the smallest particles?

(b) which one has the largest particles?

There is a large group of materials P which can be divided into three groups Q, R, and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.

(a) What could the group of materials P be?

(b) Name the substances Q. Give two examples of such substances.

(c) Name the substances R. Write two examples of such substances.

(d) Name the substances S. Give two examples of such substances.

(e) Out of Q, R and S, which substances are malleable and ductile?

A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid a vaporizes completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporizes completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid c has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO₄ to blue.

(a) Which liquid could be an element? Name this element.

(b) Which liquid could be a mixture? Name this mixture.

(c) Which liquid could be a compound? Name this compound.

(d) What could the solid D be?

(e) What do you think is liquid E?

What is the name of the clear liquid formed when a solid dissolves in a liquid?

Which of the two will scatter light: soap solution or sugar solution? Why?