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Question:

a and b are Van der Waals constants for gases. Chlorine is more easily liquefied than ethane because:

a and b for Cl2 > a and b for C2H6

a for Cl2 < a for C2H6 but b for Cl2 > b for C2H6

a for Cl2 > a for C2H6 but b for Cl2 < b for C2H6

a and b for Cl2 < a and b for C2H6

Solution:

Ease of liquefaction is proportional to a
For C2H6, a = 5.49, b = 0.0638
For Cl2, a = 6.49, b = 0.0562
Compressible gases have greater force of attraction and hence, value of 'a' should be greater and reduced volume 'b' should be less.