Question

Which combination of following terms is matched correctly?
(I) Intermolecular forces
(II) Latent heat of vaporization
(III) Vapour pressure

	I	II	III
(a)	High	Weak	Small
(b)	High	Strong	Large
(c)	Low	Weak	Large
(d)	Low	Strong	Small

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (A)

Liquid $\rightleftharpoons$ Vapour
(a) If vapour pressure is high, it means equilibrium is in forward side. This is attained when intermolecular forces holding the molecules are of weak nature. Low heat is required to convert liquid into vapour. Thus, (a) is correct
(b) Thus, incorrect
(c) When vapour pressure is low, it means intermolecular forces are strong hence (c) is incorrect
(d) When, vapour pressure is low, intermolecular forces are strong, hence large heat is required thus, (d) is incorrect