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States of Matter — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStates of Matter1 Mark
MCQ
The liquefaction behaviour of the temporary gases like $\ce{CO_2}$ approaches that of permanent gases like $\ce{N_2 , O_2}$ etc., as we go :
  • A
    Below critical temperature.
  • ✓
    Above critical temperature.
  • C
    Above absolute zero.
  • D
    Above absolute zero.
✓

Answer

Correct option: B.
Above critical temperature.
Critical temperature of a gas is highest temperature at which liquefaction of gas first occur. Liquefaction of permanent gases requires cooling as well as considerable compression.
But temporary gases like $\ce{CO_2}$ and $\ce{CH_4}$ approach that of permanent gases as we go above the critical temperature.

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