State whether the following statements are True or False:
$(i)$ Attractive or repulsive forces act between molecules of an ideal gas.
$(ii)$ The potential energy of an ideal gas is zero.
$(iii)$ Molecules of all gases are the same in size.
$(iv)$ Molecules of an ideal gas are perfectly elastic spheres.

(A) $(i)$ False. By definition,there are no intermolecular forces of attraction or repulsion in an ideal gas.
$(ii)$ True. Since there are no intermolecular forces,the potential energy associated with the interaction between molecules is zero.
$(iii)$ False. Different gases have molecules of different sizes and structures.
$(iv)$ True. According to the kinetic theory of gases,ideal gas molecules are considered point masses or perfectly elastic spheres that undergo elastic collisions.