Number of correct statements are- (i) Azeotrope obey Raoult's law (ii) Minimum boiling point azeotrope is formed if Δ H mix

Question

Number of correct statements are-

(i) Azeotrope obey Raoult's law

(ii) Minimum boiling point azeotrope is formed if $Δ H_{mix} < O$

(iii) $Δ H_{vap}$ for ideal aqueous solution containing non-volatile solute is same as $Δ H_{vap}$ for pure water

(iv) When azeotrope is vapourised, composition of vapour formed is same as solution.

TestHub · Accepted Answer

(i) Incorrect: Azeotropes are non-ideal solutions, so they do not obey Raoult's law.

(ii) Incorrect: For minimum boiling azeotropes, $Δ H_{mi x} > 0$ .

(iii) Correct: The addition of a non-volatile solute decreases vapor pressure. However, $Δ H_{v a p}$ remains unaffected.

(iv) Correct: In the case of azeotropes, the composition of vapors formed is the same as the solution after vaporization.

Correct statements = 2

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