CBSE Class 12 · 2015 · Delhi · SolutionsShort Answer

Define azeotropes. What type of azeotrope is formed by positive deviation from Raoult's law? Give an example.

Solution

Azeotropes are binary liquid mixtures that boil at a constant temperature and have the same composition in liquid and vapour phases, so their components cannot be separated by fractional distillation.
Solutions showing large positive deviation form minimum-boiling azeotropes.
Example: ethanol–water containing approximately 95% ethanol by volume.

CBSE Class 12 Board · 2015 · Delhi · Subjective

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