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Question

A graph of vapour pressure and temperature for three different liquids X,Y and Z is shown below:
The following inferences are made:
A) X has higher intermolecular interactions compared to Y
B) X has lower intermolecular interactions compared to Y 
C) Z has lower intermolecular interactions compared to Y 
The correct inference(s) is/are:
  1. C
  2. A
  3. B
  4. A and  C


Solution

The correct option is C B
As shown in the plot below, for the same T, the vapour pressure of X is the highest and of Z is the lowest. Now, that means with the same average K.E. of X,Y and Z molecules, the X molecules are able to compensate their respective intermolecular forces better. So, X molecules have the highest vapour pressure. Which implies that the intermolecular forces in X are the weakest among the three. The opposite could be said for Z as well.

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