22-carat is not a pure gold because for making ornaments 22-carat gold is used which contains 22 parts of gold and 2 part of copper by weight.

In a solution, the component present in lesser amount by weight is called solute and the component present in larger amount by weight is called solvent.

Since the particles in gases are far apart there is a lot of space between them. Therefore they can be forced to get closer or compressed when the volume decreases the pressure increases.

(i) miscible liquids can be separated by using Liebig condenser.
(ii) immiscible liquids can be separated by using separating funnel.

Charcoal adsorbs gases on its surface. Charcoal is called the adsorbent and the gas is called the adsorbate.

The smiley ball can be easily compressed. The particles in gases are far apart and there is a lot of space between them. So, the particles can be forced to get closer and can easily be compressed.

Brownian movement:
When colloidal solution are viewed under powerful microscope, it can be seen that colloidal particles are moving constantly and rapidly in zig-zag directions. The Brownian movement of colloidal particles is due to the unbalanced bombardment of the particles by the molecules of dispersion medium.
Example: Motion of pollen grains in water.

Tyndall effect: 
Tyndall (1869) observed that when a strong beam of light is focused on a colloidal solution the path of the beam becomes visible. This phenomenon is known as Tyndall effect and the illuminated path is called Tyndall cone. This phenomenon is not observed in case of true solution.
Example: When fine beam of light pass through the true solution, the light is invisible but the enters the colloidal solution the light is visible.