In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following

Free expansion, W = 0Adiabatic process, q =0ΔU=q+W=0, this means that internal energy remains constant. Therefore, ∆T = 0. In an ideal gas there is no intermolecular attraction. Hence, when such a gas expands under adiabatic conditions into a vacuum, no heat is absorbed or evolved since no external work is done to separate the molecules.