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Question

Which of the following is true regarding maximum boiling azeotropes?

A
ΔSmix<0
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B
Azeotropic mixture has higher vapour pressure as compared to vapour pressure of each component in pure state.
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C
ΔHmix<0
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D
ΔGmix>0
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Solution

The correct option is C ΔHmix<0
Maximum boiling azeotropes are those which boil at a higher temperature than the boiling point of each component in a pure state, e.g., 68 % nitric acid and 32 % water by mass.
Consequently, Azeotropic mixture has lower vapour pressure as compared to vapour pressure of each component in pure state.
Here,
ΔHmix<0
ΔVmix<0
ΔGmix<0
ΔSmix>0

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