Q. 8

Gases possess cha A. H2, He, O2, N2

B. He, O2, H2, N2

C. N2, O2, He, H2

D. O2, N2, H2, He

Answer :

There are 2 conditions for liquefaction of gases:

• Low temperature

• High pressure

LOW TEMPERATURE: As the temperature of a gas is low, the kinetic energy of the molecule also decreases, which leads volume to get decrease. As the temperature decreases, molecules come close to each other and changes into a liquid.

HIGH PRESSURE: As the pressure increases, makes gas molecule come close to each other and convert into liquid. For each gas, there is a specific temperature above which gas never be liquefied, however, high pressure is applied.

Therefore the effect of temperature is more important than that of pressure.

Liquefaction of so-called permanent gases like dihydrogen, helium is difficult, as they show positive deviation in the value of compressibility. So they require high pressure so that moleculescome close to each other and low the temperature to slow the movement of molecules. These 2 conditions tell about the liquefaction of gases. Therefore O2> N2> H2,> He

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