MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryGaseous statePrevious Year Questions

a and b are van der Waals constants for gases. Chlorine is more easily liquefied than ethane because (KCET 2011)

A.a and b for Cl2> a and b for C2H6

B.a and b for Cl2< a and b for C2H6

C.a for Cl2> a for C2H6 but b for Cl2> b for C2H6

D.a for Cl2> a for C2H6 but b for Cl2< b for C2H6✓ Correct

Explanation

The importance of the Van der Waals constants a and b is- The constant ‘a’ gives the measure of intermolecular forces of attraction. The constant b gives the measure of molecular size. If a > b then gas can liquefy easily. Therefore, chlorine is more easily liquefied than ethane because a value of chlorine is greater and b value of chlorine is less.

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