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Q. Given below are few mixtures formed by mixing two components. Which of the following binary mixtures will have same composition in liquid and vapour phase ?
(i) Ethanol + Chloroform
(ii) Nitric acid + Water
(iii) Benzene + Toluene
(iv) Ethyl chloride + Ethyl bromide

Solutions

Solution:

(iii) and (iv) will form ideal solutions hence do not form azeotropes. Azeotropes have same composition in liquid and vapour form when distilled.