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Question:

For real gas, the van der Waals equation is written as: (p + a(n²/V²))(V - nb) = nRT where a and b are van der Waals constants. Two sets of gases are: (I) O₂, CO₂, H₂ and He (II) CH₄, O₂ and H₂. The gases given in set-I in increasing order of 'b' and gases given in set-II in decreasing order of 'a' are arranged below. Select the correct order from the following:

(I)He<H2<O2<CO2;(II) CH4>O2>H2

(I)He<H2<CO2<O2;(II) CH4>H2>O2

(I)O2<He<H2<CO2;(II) H2>O2>CH4

(I)H2<O2<He<CO2;(II) O2>CH4>H2

Solution:

As per actual data's sequence of Vander Waal's constant (a and b) given above. The increasing order of "b" for the gases of set-I is He < H₂ < O₂ < CO₂. The decreasing order of "a" for the gases of set-II is CH₄ > O₂ > H₂.