Question
An ideal gas, obeying kinetic theory of gases cannot be liquefied, because
A.
it solidifies before becoming a liquid
B.
forces acting between its molecules are negligible
C.
its critical temperature is above $$0{\,^ \circ }C$$
D.
its molecules are relatively small in size.
Answer :
forces acting between its molecules are negligible
Solution :
A gas can only be liquefied, if some forces of attraction are acting in its molecules. Since an ideal gas is devoid of force of attraction in its molecules, therefore it cannot be liquefied.