Gaseous state is chracterised by which of the following physical properties? 1. Gases mix evenly and completely on all proportions without any mechanical aid. II. Gases exert pressure on all directions evenly. MI. Gases are highly compressible and have lower density than liquids and solids. IV. The volume and shape of the gas is fixed.

Step-by-step solution

(I) Gases mix evenly without the help of any mechanical change. The huge gap between molecules gives the molecules of other elements an ease to mix with each other. Thus statement (I) is correct. (II) The molecules in a gaseous element scatter by forces in all direction due to the negligible force of attraction between them. Therefore, the molecules exert pressure in all directions. Hence, statement (II) is correct. (III) Gases are highly compressible. As the molecules in gaseous elements are scattered at a large d