Which of the following azeotropic solutions has the boiling point less than boiling point of the constitutents A and B?

C H C l_{3}

and

C H_{3} C O C H_{3}

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H_{2} O

and

H N O_{3}

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C H_{3} C H_{2} O H

and

C H_{3} C O C H_{3}

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H e x a n e

and

h e p t a n e

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Solution

The correct option is C $C H_{3} C H_{2} O H$ and $C H_{3} C O C H_{3}$
Mixtures of $C H_{3} C H_{2} O H$ and $C H_{3} C O C H_{3}$ shows positive deviation from Raoult's law. So, vapour pressure of the solution increases and boiling point decreases. Since, higher the vapor pressure, lower the boiling point.

A) and B) shows negative deviation
D) ideal solution

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