Which of the following binary mixtures will have same composition in liquid and vapour phase?

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 mixtures of benzene-toluene and n - hexane - n - heptane are the examples of ideal solutions.