b) Give reason: -
i) o-nitrophenol and p-nitrophenol can be separated by steam distillation.
ii) There is a large difference in boiling points of alcohols and ethers. 

A mixture of o-nitrophenol and p-nitrophenol can be separated by

The mixture of o-nitrophenol and p-nitrophenol can be best seprated by

The boiling points of alcohols and phenol are high. Give reason.

Oxygen and sulphur have difference in their melting point and boiling points. Give reason.

The solution which boil at constant temperature like a pure liquid and possess same composition in liquid as well as vapour state are called azeotropes. The components of azetropes cannot be separated by fractional distillation. Only non-ideal solutions form azeotropes. Solutions with negative deviation form maximum boiling azeotrope and the solutions with positive deviation form minimum boiling azeotrope. The boiling point of an azeotrope is never equal to the boiling points of any of the components of the azeotrope. Answer the following question: The azeotropic solutions of two miscible liquids 100 mL of liquid A and 50 mL of liquid B are mixed to form 138 mL solution. It is

Account for the following: (i) The boiling point of ethanol is higher than that of methanol. (ii) Phenol is a stronger acid than an alcohol. (iii) The boiling points of ethers are lower than isomeric alcohols.

Give reasons for (i) Both strands of DNA are not copied during transcription. (ii) Transcription and translation in bacteria can be coupled.

Give reason for - (i) Both strands of DNA are not copied during transcription. (ii) Transcription and translation in bacteria can be coupled.