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The vander waal's constant "a" for gase...

The vander waal's constant "a" for gases P,Q,R and S are 4.17 , 359 . 6.71 & 3.8 atm `L^(2) " mol"^(-2)` . Therefore , the ascending order of their ease of liquefaction is :-

A

`RltPltSltQ`

B

`QltSltRltP`

C

`QltSltPltR`

D

`RltPltQltS`

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