NEET 2012 Chemistry question
For real gases van der Waals equation is written as
(P + )(V - nb) = nRT
where 'a' and 'b' are van der Waals constants. Two sets of gases are: I. , , and He II. , and 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:
Answer: (4)
Solution
The constant 'a' measures intermolecular attraction, which grows with molecular size/polarisability: (): 2.25 > 1.36 > 0.244. So set II in decreasing order of 'a' is . Options (1), (2) and (3)
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