Amongst the following statements,the correct one is

  • A
    The gas can not be compressed below the critical temperature.
  • B
    Below critical temperature,thermal motion of the molecules is slow enough for the intermolecular forces to come into play leading to condensation of the gas.
  • C
    At critical temperature liquid and gaseous phase can be distinguished.
  • D
    An ideal gas has a characteristic critical temperature.

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Isotherms of carbon dioxide at various temperatures are represented in the figure. Answer the following questions based on this figure.
$(i)$ In which state will $CO_2$ exist between the points $a$ and $b$ at temperature $T_1$?
$(ii)$ At what point will $CO_2$ start liquefying when temperature is $T_1$?
$(iii)$ At what point will $CO_2$ be completely liquefied when temperature is $T_2$?
$(iv)$ Will condensation take place when the temperature is $T_3$?
$(v)$ What portion of the isotherm at $T_1$ represents liquid and gaseous $CO_2$ at equilibrium?

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