A gas can be liquefied

A real gas can be liquefied by ?

CO_(2) gas can be liquefied under pressure between

Boyle temperature of vaiour gases are given below : {:("Gas",T_(B)(K),),(H_(2),117,),(He,23,),(CH_(4),498,),(O_(2),406,):} Which gas can be liquefied most easily ?

Boyle's temperature of four gases are given below: {:("Gases"," "A,B,C,D,),(T_(B),120K,25K,500K,410K,):} Which gas can be liquefied most easily ?

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure . While sharing her experience with friends she got confused . Help her to identify the correct set of conditions.

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure . While sharing her experience with friends she got confused . Help her to identify the correct set of conditions.