The correct options are
A Liquid state of ideal gas is impossible
B Real gas behave as ideal gas at high temperature and low pressure
C At any temperature and pressure, ideal gas obeys Boyle's law and charles' law
Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure as the work which is against intermolecular forces becomes less significant compared with the particles' kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them.
Option(A)
At high temp and low pressure, density is small. hence, the gas will behave like an ideal gas.
Option(B):
Inter molecular force is zero. hence, liquid state is impossible.
Option (C):
At any temperature and pressure, ideal gas obeys Boyle's law and Charles' law
Option (D):
The molecules of real gas exert any force on one another.