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Which of the following cannot form an azeotrope?

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in Chemistry – Class 12 by (188k points)
Which of the following cannot form an azeotrope?

(a) H2O + C2H5OH

(b) CHCl3 + C2H5OH

(c) HCl + H2O

(d) Benzene + Toluene

This question was addressed to me in an international level competition.

This interesting question is from Ideal and Non-Ideal Solutions topic in chapter Solutions of Chemistry – Class 12

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Correct option is (d) Benzene + Toluene

To elaborate: H2O + C2H5OH forms an azeotrope with a boiling point of 351.15 K. CHCl3 + C2H5 OH forms an azeotrope with a boiling point of 332.3 K. HCl + H2O forms an azeotrope with a boiling point of 383 K. Benzene + Toluene is an ideal solution and hence does not form an azeotrope.

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