CBSE Class 12 Chemistry — Solutions

Which of the following solutions will have the lowest freezing point in water?

Assertion (A): It is not possible to separate the components of an azeotrope by fractional distillation. Reason (R): Components of an azeotrope have the same composition in liquid and vapour phase and boil at a constant temperature.

What type of deviation from Raoult's law is shown by a mixture of phenol and aniline? Give reason. What will happen to the boiling point of the solution on mixing phenol and aniline?

Calculate the boiling point of a solution containing 0.61 g of benzoic acid ($\text{Molar mass} = 122 \text{ g mol}^{-1}$) in 5 g of CS₂ in which it dimerises to the extent of 88%. The boiling point and Kb of CS₂ are 46.2 °C and $2.3 \text{ K kg mol}^{-1}$ respectively.