Give reason for the following observations.
We can get the smell of perfume sitting several metres away.

Give reasons for the following observation. The smell of hot sizzling food reaches you several matters away but to get the smell from cold food you have to go close.

Give reason for the following. Stability of colloids.

Give reason for the following observations. Naphthalene balls disappear with time without leaving any solid.

Give reason for the following. Brownian movement of colloidal particles.

Give reason for the following : PbCl_(4) is more covalent than PbCl_(2) .

Give reasons for the following : (a) A square can be thought of as a special rectangle.

Give reasons for the following observation: (a)The element carbon forms a very large number of compounds. (b)Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. c)Use of synthetic detergents causes pollution of water.

Give reasons for the following : (c ) A Square can be thought of as a special rhombus.