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An ideal gas can’t be liquefied because:

1. Its critical temperature is always above 0°C
2. Its molecules are relatively smaller in size
3. It solidifies before becoming a liquid
4. Forces operated between its molecules are negligible

Correct answer: Forces operated between its molecules are negligible

Solution

An ideal gas cannot be liquefied because it assumes no intermolecular forces exist between its molecules, which is a key requirement for liquefaction.

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