Which outcome occurs when a binary azeotropic mixture undergoes fractional distillation at constant pressure?

💡 Explanation

When an azeotropic mixture undergoes fractional distillation, the vapor and liquid compositions converge until reaching the azeotropic point because the relative volatility approaches unity, leading to a constant overhead vapor composition. Therefore constant overhead vapor composition is attained is correct, rather than complete separation, temperature change or flow reversal, which are not azeotropic behaviors.

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