Question

21. Identify the wrong statement among the following

• A. Molecules of solids possess only vibratory motion.
• B. Solids are incompressible.
• C. Solids have only one free surface.
• D. Gases are highly diffusible.

Answer 1

The correct option is C

Solids have only one free surface.

Explanation for correct option:

(C) The intermolecular force of attraction between the particles of solids are very strong thus, their shape and volume are fixed. Thus, solids have a lot of free surfaces.

Explanation for incorrect options:

(A) Particles of solids possess vibratory motion because the position of the particles is fixed.

(B) Solids have a definite shape and are hence incompressible.

(D) Gases have weak intermolecular force of attraction between atoms and hence can move freely and can diffuse.

Hence, option (C) is the correct answer.