The liquefaction behaviour of temporary gases like CO _2 approaches that of permanent gases like N _2, O _2 etc., as we go

JEE Main Chemistry question

The liquefaction behaviour of temporary gases like approaches that of permanent gases like etc., as we go

(A)Below critical temperature
(B)Above critical temperatureCorrect
(C)Above absolute zero
(D)Below absolute zero

Answer: (B)

Solution

Permanent gases like and have very low critical temperatures, so at ordinary conditions they are always well above their own critical temperature and resist liquefaction by pressure alone. As

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Question ID VK-134106