2 moles of liquid A   P A o = 100 torr ) and 3 moles of liquid B P B o = 150 torr ) form a solution…

2 moles of liquid A PAo=100torr) and 3 moles of liquid BPBo=150torr) form a solution having vapour pressure of 120 torr. Based upon this observation one can conclude :-
  1. Interaction between like molecules is greater than those between unlike molecules
  2. Interaction between like molecules is less than those between unlike molecules
  3. Interaction between like molecules is equal to those between unlike molecules
  4. ΔSmixing =0

Solution

For ideality,
P=PAoXA+PBoXB
P=100×25+150×35=40+90
P=130 torr>given P=120 torr
⇒ -ve deviation ∴ A-B interaction >A-A & B-B 
interactions ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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