Molecules of a gas behave like

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.

In a thermodynamic system,the working substance is an ideal gas. Its internal energy is in the form of

Can we consider a container of irregular shape while calculating the pressure of an ideal gas? Why?

The molecules of an ideal gas at a certain temperature have

What are the three fundamental states of matter? Explain them briefly.