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Question

Which of the following is/are true regarding minimum boiling azeotropes?

A
ΔHmix>0
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B
ΔVmix<0
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C
ΔGmix<0
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D
ΔSmix>0
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Solution

The correct option is D ΔSmix>0
Minimum Boiling azeotropes:
Minimum boiling azeotropes are those which boil at a lower temperature than boiling point of each component in the pure state. Consequently vapour pressure of the mixture is higher than each component.
Example 95.5 % ethyl alcohol and 4.5 % water by mass forms a minimum boiling azeotrope


Here,

ΔHmix>0
ΔVmix>0
ΔSmix>0
ΔGmix<0

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