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Question
Which among the following gases is difficult to liquify?
Options
Ammonia
Carbon dioxide
Oxygen
Chlorine
MCQ
Solution
Oxygen
Explanation:
When the temperature of gas falls below the critical temperature (Tc), it can be liquefied by cooling or applying pressure.
Gases with higher critical temperatures like Cl2, NH3, CO2, SO2 etc. can be liquefied easily by applying suitable pressure.
Gases like H2, N2, O2 have low Tc, so it cannot be liquefied easily by pressure and cooling.
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Liquefaction of Gases and Critical Constant
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