To solve this problem, we need to understand the concept of azeotropes.$\\$An azeotrope is a mixture of two or more liquids that has a constant boiling point and$\\$retains the same composition in the vapor phase as in the liquid phase during distillation.$\\$There are two types of azeotropes:$\\$• Minimum boiling azeotropes: These have a boiling point lower than any of the pure components.$\\$• Maximum boiling azeotropes: These have a boiling point higher than any of the pure components.$\\$Let's analyze the given options:$\\$Option 1: Water + Nitric acid$\\$• This mixture forms a maximum boiling azeotrope. The azeotropic mixture of water and nitric acid$\\$ boils at a higher temperature than either pure water or pure nitric acid.$\\$Option 2: Ethanol + Water$\\$• This mixture forms a minimum boiling azeotrope. The azeotropic mixture boils at a lower$\\$ temperature than either pure ethanol or pure water.$\\$Option 3: Acetone + Carbon disulphide$\\$• This mixture does not form an azeotrope.$\\$Option 4: Heptane + Octane$\\$• This mixture does not form an azeotrope.$\\$Therefore, the correct answer is Option 1: Water + Nitric acid, which forms a maximum boiling azeotrope.