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Grade: upto college level
         The value of van der Waals’ constant ‘a’ for the gases O2, N2, NH3 and CH4 are 1.360, 1.390, 4.170 and 2.253L2 atm mol-2 respectively. The gas which can most easily be liquefied is 

a. O2
b. N2
c. NH3
d CH4
5 years ago

Answers : (3)

Jitender Pal
askIITians Faculty
365 Points
							Sol.   The ease of liquification of a gas depends on their intermolecular force of attraction which in turn is measured in terms of van der Waals’ constant ‘a’. Hence, higher the value of ‘a’, greater the intermolecular force of attraction, easier the liquification.
In the present case, NH3 has highest ‘a’, can most easily be liquefied.

						
5 years ago
venkatesh
19 Points
							
ease of liquification is directly proportional to ‘a’.If the value of ‘a’ is more then if we apply even less pressure also the gas can be liquified,so in order to liquify easily we should have more ‘a’. so more ‘a’ =more easily liqification.  
one year ago
Tejovanth
11 Points
							As NH3 has higher *a value, it can be easily liquifiable. Such that [rate of liquification is directly proportional to a value]
						
one year ago
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