Select the correct statement.
a. A mixture of ideal gases is cooled up to liquid the temperature ( 4.22 K ) to form ideal solution.
b. Ideal gas can be liquefied on applying pressure and lowering temperature.
c. Kinetic energy of a gas is zero at 0∘C .
d. Ideal gas on subjecting to Joule-Thomson effect do not show cooling on account of absence of molecular forces of attraction.