What are azetopes?
Azeotropes are the constent boiling mixtures or solutions.
it means that these mixtures can not be separated by simple distillation or boiling , because they will have the same composition of mixture even in the vapour state.
for example as in case of mixture of nitric acid and water, the highest attained concentration of the nitric acid is 68% . After this the distilled vapours also have the same concentration that is 68% nitric acid and 32% water.