Which of the following is an example of an azeotropic mixture?
Ethanol and water
Hydrogen chloride and water
Nitric acid and water
All of the above
An azeotropic mixture is a type of mixture that boils at a constant temperature and has the same composition in both liquid and vapour phases. Option A, which is a mixture of ethanol and water, forms an azeotropic mixture at ethanol and
water. Option B, which is a mixture of hydrogen chloride and water, forms an azeotropic mixture at
hydrogen chloride and
water. Option C, which is a mixture of nitric acid and water, forms an azeotropic mixture at
nitric acid and
water.
Therefore, all of the above options (A, B, and C) are examples of azeotropic mixtures. Hence, the correct answer is option D.