Question

The intermolecular forces of attraction are maximum in _______.
A. solid
B. liquid
C. gas
D. none of these

Answer 1

‌ Initially for solving the question we must know what are intermolecular forces, what are the key factors which affect these forces. Also, we should know the properties of these phases of matter so that it would be easy for us to get the answer. After exploring all this it would be easier for us to utter the answer.

Complete step by step answer:
Intermolecular forces in lay man language can be explained as all the factors which help us in creating a matter, i.e., it must be at a smaller level (forces between atoms). It can be explained as the forces which act between molecules. These are of four types namely Ionic bonds, Hydrogen bonding, Van der Waals dipole-dipole interactions, Van der Waals dispersion forces.
In solid the molecules are closely packed, whereas in liquid molecules are loosely packed while in gas molecules are very loosely arranged.
Since intermolecular forces are dependent over the molecular arrangements therefore it is easy to answer that it is highest in solid then in liquid and minimum in gas.
So, the correct order is $Solid > Liquid > Gas.$
So, the option A is the correct option.

Note: The intermolecular forces are weak in comparison with intramolecular forces. Intermolecular forces are repulsive at short distances and attractive at long distances.The order for the subcategory of the forces is:
$\text{Ionic bonds > Hydrogen bonding > Vander waals dipole - dipole interactions > Vander waals dispersion forces.}$
The investigation of intermolecular forces starts from macroscopic observations which indicate the existence and action of forces at a molecular level. These observations include non-ideal-gas thermodynamic behaviour reflected by viral coefficients, vapour pressure, viscosity, superficial tension, and absorption data.