Question

An ideal gas cannot be liquefied because
i) It's critical temperature is always above 0°C
ii) it's molecule are relatively small in size
iii) it solidifies before becoming a liquid
iv) forces operative between its molecules are negligible

Answer 1

The answer of the question is iv (forces operative between its molecules are negligible)

Answer 2

the answer is 4 forces operative between its molecules are negligible