Which of the following is correct regarding the liquid state?
(i) A liquid can exist only between the boiling and melting point of a substance .
(ii) Liquids diffuse slowly through other liquids.
(iii) liquids consist of disordered clusters of particles that are quite close together, particles have random motion in three dimensions.
(iv) A liquid resembles a gas near the critical temperature and resembles a solid near the melting point of the substance.

Options

A. `(i),(ii),(iii)`
B. `(i),(ii),(iii),(iv)`
C. `(i),(iii),(iv)`
D. `(ii),(iii)`

Answer

B

Explanation

A substance exists in the liquid state above its melting point and below its boiling point. Liquids diffuse into other liquids with which they miscible. For example, when a drop of red food coloring is added to a glass of water , the water becomes red throughout after diffusion is complete. Thus , the miscibility of two liquids refers to their ability to mix and produce a homogeneous solution . The natural diffusion rate is slow at normal temperatures because intermolecular distances are small , hence , the molecules (in the liquid state) undergo a large number of collisions with the neighboring molecules.
Because the average separations among the particles in liquids are far less than those in gases , teh densities of liquids are much higher than the densities of gases. Because liquids are denser than gaes , the collision rate among molecules is much higher in the liquid phase than in the gas phase.