. Assertion: The value of van der Walls constant a for ammonia is larger than that of nitrogen gas


Reason: Molecular weight of ammonia is smaller than nitrogen gas

Best Answer

Answer ||| a

Solution ||| Molecular weight of ammonia (NH3) = 14 + 3 = 17

 Molecular weight of nitrogen gas (N2) = 14 + 14 = 28

Smaller the molecular weight of a gas, higher the value of van der Waals’ constant ‘a’ for it. Thus, between NH3 and N2, the value of van der Waals’ constant ‘a’ is higher for NH3.

 

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