Answer the questions (given below) which are based on the following diagram. Consider some facts about the above phase diagram: Vapour pressure diagram for real solutions of two liquids A and B that exhibit a positive deviation from Raoult’s law. The vapour pressure of both A and B are greater than predicted by Raoult’s law. The dashed lines represented the plots for ideal solutions.
(i) A : This is observed when A...B attractions are greater than average of A...A and B...B attraction:
B : Δ H mix = +ve, Δ V mix = +ve
C : Boiling point is smaller than expected such that vaporisation is increased
D : Mixture can form azeotropic mixture
Select correct facts.
Text Solution
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(i) B, C and D are the conditions and facts for positive deviation from Raoult’s law.
is incorrect.
Because A–B attractive force should be weaker than A–A and B–B attractive forces.
(ii) X A P A 0 + X B P B 0 = 
× 100 + 
× 60 = 70 mm of Hg
Now P A + P B > X A P A 0 + X B P B 0
i.e., positive deviation from Raoult’s law.
for positive deviation, B.P. < expected value
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