If two liquids A and B form minimum boiling azeotrope at some specific composition then :

A-B interactions are stronger than those between A-A or B-B

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vapour pressure of solution increases because more number of molecules of liquids A and B can escape from the solution

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vapour pressure of solution decreases because less number of molecules of liquids A and B can escape from the solution

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show a large positive deviation from Raoult's law

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Solution

The correct option is B show a large positive deviation from Raoult's law
Minimum boiling azeotrope means the liquid have lower boiling point than its individual parts, that means the interaction between the liquid particles decreases.
Thus, it show large deviation from Raoult's law.

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Question 23
If two liquids A and B form minimum boiling azeotrope at some specific composition then
(a) A-B interactions are stronger than those between A-A or B-B
(b) vapour pressure of solution increases because more number of molecules of liquids A and B can escape from the solution
(c) vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution
(d) A-B interactions are weaker than those between A-A or B-B

For a solution to form positive deviation,the solute-solvent interactions must be less than solute-solute and solvent-solvent interactions,making it easier for the molecules to escape in its pure form.still,why does the vapour pressure of the solution showing positive deviation increase compared to the pure form?

Q. CASE1: Read the passage given below and answer the following question.

The solution which obeys Raoult’s law over the entire range of concentration are known as ideal solutions. The solution which does not obey Raoults law over the entire range of concentration, then it is called non-ideal solution. The vapour pressure of such as a solution is either higher or lower than that predicted by Raoult’s law. If it is higher, the solution exhibits positive deviation and if it is lower, it exhibits negative deviation from Raoult’s law.
Some liquids on mixing, form azeotropes which are binary mixture having the same composition in liquid and vapour phase. There are two types of azeotropes. Minimum boiling azeotropes and maximum boiling azeotropes.

Which of the following solutions show negative deviation from Raoult’s law?
[0.77 Mark]

Q. CASE 1: Read the passage given below and answer the following question

The solution which obeys Raoult’s law over the entire range of concentration are known as ideal solutions. The solution which does not obey Raoults law over the entire range of concentration, then it is called non-ideal solution. The vapour pressure of such as a solution is either higher or lower than that predicted by Raoult’s law. If it is higher, the solution exhibits positive deviation and if it is lower, it exhibits negative deviation from Raoult’s law.
Some liquids on mixing, form azeotropes which are binary mixture having the same composition in liquid and vapour phase. There are two types of azeotropes. Minimum boiling azeotropes and maximum boiling azeotropes.

Correct statement(s) about azeotropes is/are:
[0.77 Mark]

Q. If two liquids A and B form a minimum boiling azeotrope at some specific composition then:

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If two liquids A and B form minimum boiling azeotrope at some specific composition then :

The correct option is B show a large positive deviation from Raoult's law Minimum boiling azeotrope means the liquid have lower boiling point than its individual parts, that means the interaction between the liquid particles decreases.Thus, it show large deviation from Raoult's law.

The correct option is B show a large positive deviation from Raoult's law
Minimum boiling azeotrope means the liquid have lower boiling point than its individual parts, that means the interaction between the liquid particles decreases.
Thus, it show large deviation from Raoult's law.