Dilute hydrochloric acid cannot be concentrated beyond which of the following concentrations by boiling (in $\%$)?

Which of the following binary mixtures does not show the behavior of minimum boiling azeotropes?

Which one of the following is the correct statement? If an azeotropic solution of two liquids has a boiling point higher than both of them,then it:

Why is it not possible to obtain pure ethanol by fractional distillation? What general name is given to binary mixtures which show deviation from Raoult’s law and whose components cannot be separated by fractional distillation? How many types of such mixtures are there?

Rectified spirit obtained by fermentation contains $4.5 \%$ of water. To remove this water,rectified spirit is mixed with a suitable quantity of benzene and heated. Benzene helps because:

The mixture of ethanol and water cannot be separated by simple distillation because: