The van der Waal's gas constant 'a' is given by:

1.	The van der Waal's gas constant 'a' is given by:
Answer» `(1)/(3)V_(C)` `3P_(C)V_(C)^(2)` `(1)/(8)(RT_(C))/(P_(C))` `(27)/(64)(R^(2)T_(C)^(2))/(P_(C))` Answer :b,d

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