Select the correct statement.
(1) A mixture of ideal gases is cooled to the liquid temperature (4.22K) to form an ideal solution.
(2) An ideal gas can be liquefied by applying pressure and lowering temperature.
(3) The kinetic energy of a gas is zero at 0∘C.
(4) An ideal gas subjected to the Joule–Thomson effect does not show cooling because of the absence of intermolecular forces of attraction.