question_answer 85)

  Which of the following binary mixtures will have same composition in liquid and vapour phase? (a) Benzene-toluene     (b) Water-nitric acid (c) Water-ethanol            (d) n ? hexane ? n-heptane

Answer:

                  (b, c) Mixtures having same composition in liquid and vapour phase are known as azeotropes. , Azeotropes boils at same temperature. Here, water-nitric acid and water-ethanol mixtures are non-ideal solution. Hence, water-nitric acid and water-ethanol are examples of azeotropes. While benzene-toluene and n-hexane?n-heptane are examples of ideal solution.