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$Δ S_{(t o t a l) m i x}$ for all types of solutions (ideal & non – ideal solutions) is positive.

$Δ G_{(s y s t e m) m i x}$ of ideal solutions is negative

An azeotrope of $H N O_{3} + H_{2} O$ has approximate composition of about 68% $H_{2} O$ and 32% $H N O_{3}$ by mass at BP of 393.5K, it is an example of maximum boiling point azeotrope

Azeotropes are binary mixtures having the same composition in liquid and vapour phase and boil at constant temperature

answer is C.

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Detailed Solution

$\begin{array}{l} Δ S_{m i x} = + v e \\ Δ G_{m i x} = - v e \end{array}]$ for both ideal and non ideal solution

For $H N O_{3} + H_{2} O$ azeotrope at 393.5 K; water is 32% by wt and $H N O_{3}$ is 68% by wt.

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