Ncert Exercises & Solutions

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

Gases	H₂	He	O₂	N₂
The critical temperature in Kelvin	33.2	5.3	154.3	126

From the above data, the order of liquefaction of the given gases is-
(write the order from the gas liquefying first)
1. $H_{2},$ $He,$ $O_{2},$ $N_{2}$
2. $He,$ $O_{2},$ $H_{2},$ $N_{2}$
3. $N_{2},$ $O_{2},$ $He,$ $H_{2}$
4. $O_{2},$ $N_{2},$ $H_{2},$ $He$

Hint: Ease of liquefication

α

Critical Temperature.

Tc = 8a /27Rb

The higher the critical temperature more easily is the gas liquified. Hence, the order of liquefaction starting with the gas liquefying first will be

O_{2},

N_{2},

H_{2},

He

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