Which among the following gases can be liquified easily ?

Options

A. Chlorine
B. Nitrogen
C. Oxygen
D. Hydrogen

Answer

A

Explanation

A gas can be liquified when its temperature is below critical temperature , by cooling or compressing it .
Gases which have high critical temperatures (such as `Cl_(2) , NH_(3) , CO_(2) , SO_(2)` etc.) can be liquified by applying a suitable pressure alone . permanent gases (such as `H_(2) , N_(2) , O_(2) `etc.) cannot be liquified by the action of pressure and cooling .