Concept:A compressed gas in a fixed container is best explained using the kinetic-molecular theory of gases.
Explanation:Gas molecules are always in constant random motion.
The actual volume occupied by the molecules is very small compared with the volume of the container.
The forces between gas molecules are negligible except during collisions.
Collisions between molecules and with the container walls are perfectly elastic.
The average kinetic energy of the molecules is directly proportional to the absolute temperature of the gas.
For a fixed mass of gas compressed in an inexpansible container, the molecules strike the walls more often and with greater effect.
As a result, the gas pressure increases and the kinetic energy of the molecules increases.
Each of the statements that matches these kinetic-molecular ideas is correct.
Answer:The correct option is C (I, II and III only).