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A gas can only be liquefied if it is first cooled below its:
AColdest temperature
BCritical temperature
CCrystal temperature
DConstant temperature
Answer & Solution
Correct answer: B. Critical temperature
1. Pressure alone will not liquefy a gas above a certain temperature.
2. Gases must be cooled below their critical temperature to be liquefied.
3. So the correct answer is critical temperature.
_Source: NCERT Class 11 Chemistry, Ch 5 'States of Matter'_
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