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a
van der waals' constants a and b of NH3 > that of N2
b
van der waals' constant a and b of NH3 < that of N2
c
aNH3>aN2 but bNH3
d
aNH3bN2
answer is A.
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Detailed Solution
If a gas is liquefied, it means volume is decreased and attractive force exists. a is a measure of attractive force and b the co-volume hence,aNH3>aN2 and bNH3>bN2