By the crystallisation of an impure compound,if the mother liquor becomes coloured,what shall be done to remove the colour?

The most suitable method of separation of a $1:1$ mixture of $ortho$- and $para$-nitrophenols is:

What is the characteristic of $R_f$ value?

Explain why an organic liquid vaporises at a temperature below its boiling point during steam distillation.

State True or False for the following statements regarding steam distillation:
$(i)$ The liquid is boiled at a temperature lower than its normal boiling point.
$(ii)$ The vapour pressure of the liquid is less than the atmospheric pressure.
$(iii)$ The sum of the vapour pressure of the liquid and the vapour pressure of water is equal to the atmospheric pressure.
$(iv)$ The mixture of organic liquid and water is obtained as the distillate.
$(v)$ The condensation of the mixture of water vapour and organic liquid vapour takes place.

Among the following,in which type of chromatography,both stationary and mobile phases are in liquid state?