Class 12 NEET Chemistry P Block Elements Questions

Air is liquefied by making use of the Joule - Thomson effect (cooling by expansion of the gas). Water vapour and CO2 are removed by solidification. The remaining constituents of liquid air i.e., liquid oxygen and liquid nitrogen are separated by means of fractional distillation (b.pt. of O2=−183°C: b.pt. of N2=−195.8°C)