Read the given statements and decide which is/are correct on the basis of kinetic theory of gases.

1. Energy of one molecule at absolute temperature is zero.
2. The rms speeds of different gases are same at same temperature.
3. For one gram of all ideal gases kinetic energy is same at same temperature.
4. For one mole of all ideal gases' mean kinetic energy is same at same temperature

IV is correct

1. If the gas is not ideal then its molecule will possess potential energy. Hence, statement (I) is wrong.
2. The rms speed of different gases at same temperature depends on its molecular weight (\(v_{rms} \propto \frac{1}{\sqrt{M}}\)). Hence, statement (II) is also wrong.
3. Kinetic energy of one gram gas depends on the molecular weight (\(E_{gm} \propto \frac{1}{M}\)). Hence, statement (III) is also wrong.
4. But KE of one mole of ideal gas does not depend on the molecular weight (\(E = \frac{3}{2}RT\)). Hence, (IV) is correct.