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Given the value of their van der Waals constant ‘a’ arrange the following gases in the order of their expected liquification pressure at a temperature T. T is below the critical point of all the gases.
Gas CH4 Kr N2 Cl2
‘a’ 2.283 2.439 1.408 6.579
(atm L2.mol–1)
(A) CH4 < Kr < N2 < Cl2
(B) N2 < CH4 < Kr < Cl2
(C) Cl2 < Kr < CH4 < N2
(D) Cl2 < N2 < Kr < CH4
(C)
a is proportional to liquefaction
so order is cl2>kr>ch4>n2
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