At ordinary temperature, why can `CO_(2)` but not `O_(2)` gas be liquefied by applying pressure? Give reason.

Explanation

A gas can be liquefied by applying necessary pressure if its temperature is equal to or below its critical temperature. The critical temperature of `CO_(2)` is above the ordinary temperature (usually `25^(@)C`) while that of `O_(2)` gas is well below one ordinary temperature. hence, `CO_(2)` can be liquefied by applying pressure at ordinary temperature.