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Liquids in Liquids

An azeotropic...

Question

An azeotropic solution of two liquids has a boiling point lower than either of them when it:

A

Shows a negative deviation from Raoult’s law

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B

Shows no deviation from Raoult’s law

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C

Shows positive deviation from Raoult’s law

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D

Is saturated

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Solution

The correct option is C Shows positive deviation from Raoult’s law
When a solution shows positive deviation from Raoult's law, the intermolecular forces of solute - solvent are weaker than solute-solute and solvent-solvent interactions. The total vapour pressure of the solution is greater than the total vapour pressure of an ideal solution. Also, the vapour pressure of each component is greater than that predicted from Raoult's law. Hence, the azeotropic mixture of two liquids boils at a lower temperature than either of them.

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Which of the following liquid pairs shows a positive deviation from Raoults law?

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.
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Q. Which of the following will show a negative deviation from raoults law?
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