Which of the following is/are correct graph(s) for a binary mixture of two volatile liquids which form a minimum boiling azeotrope?

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Both (a) and (b)

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Solution

The correct option is C
For a minimum boiling azeotrope :
Boiling point less than either of the two components.
Formed by non-ideal solutions showing positive deviation.
Vapour pressure is maximum at azeotropic concentration.
Example: $Ethanol (95.5 %) + Water (4.5 %) - Mixture boils at 351.1 K$
For minimum boiling azeotrope:

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