. Which of the following azeotropic solutions has the boiling point less than boiling point of the constituents A and B

a. CHCl3 and CH3COCH3

b. CS2 and CH3COCH3

c. CH3CH2OH and CH3COCH3

d. CH3CHO and CS2

Best Answer

Answer |||c

Solution ||| When the new interactions are weaker than those in the pure constituents, the boiling point of the resultant solution is less than that of the constituents. Such condition is found in case of non-ideal solution showing positive deviation from Raoult’s law. Among the given, solution of CH3CH2OH and CH3COCH3 is non-ideal and show positive deviation. Hence, it has lesser boiling point or higher vapour pressure

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