The State of a Gas

Q. An ideal gas cannot be liquified because

1. Its critical temperature is always above $0^{\circ }\text{C}$.
2. Its molecules are relatively smaller in size
3. It solidifies before becoming a liquid
4. Forces operating between its molecules are negligible

Q.

Which of these statements is/are true about internal energy (Eint) of a system of gas?

1. $E_{int}$ always increases as pressure increases

2. $E_{int}$ always decreases as temperature decreases

3. $E_{int}$ is proportional to volume

4. $E_{int}$ is proportional to the kinetic energy of the atoms in the system

Q. The degree of freedom of a gas is $6$. Gas can be

1. $H_2$
2. $He$
3. $N_2$
4. $O_3$

Q. Which of the following parameters does not characteristic the thermodynamic state of matter?

1. Temperature
2. Pressure
3. Work
4. Volume