1.

Assertion (A) : Surface of an adsorbent shows the preference for a particular gas. Reason (R) : van der Waals' forces are not universal.

Answer»

ASSERTION (A) and Reason (R) both are TRUE. (R) is the proper explanation of (A). 
Assertion (A) and Reason (R) both are true but (R) does not EXPLAINS (A). 
Assertion (A) and Reason (R) both are false.
Assertion (A) is not true but Reason (R) is true. 

Solution :Assertion (A) and Reason (R) both are false.


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