States of Matter

States of Matter

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 and b for Cl2 < a and b for C2H6

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

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

Answer

D.

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

Vander Waals, constant is due to force of attraction and b due to the infinite size of molecules. Thus, greater the value a and smaller the value b, larger the liquefaction.

  a b
Cl2  6.579 L2 bar mol-2 0.05622 L bar mol-2
C2H5 5.562 L2 bar mol-2 0.06380 L mol-1

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