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The value of van der waals constant ‘a’ for gases O2, N2, NH3 and CH4 are 1.360, 1.390, 4.170 and 2.253 liter^2 atm mol^–2 respectively. The gas which can most easily be liquefied is

The value of van der waals constant ‘a’ for gases   \[O_{2},N_{2},NH_{3} andCH_{4}\]    are 1.360, 1.390, 4.170 and \[2.253 liter^{2}\]  atm mol–2 respectively. The gas which can most easily beliquefied is
a) \[O_{2}\]
b) \[N_{2}\]
c) \[NH_{3}\]
d) \[CH_{4}\]

Answer: c
Explanation: The higher the value of ‘a’, more the value of Tc , easy is the liquefaction

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