When the difference in boiling points of two liquids is very small,the separation is carried out by:

Give the difference between paper chromatography and thin layer chromatography.

When is distillation under reduced pressure used?

Match column $-I$ and column $-II$ with the correct relation:

Column $-I$	Column $-II$
$(i)$ Liquid boiled at low temperature	$(a)$ Fractional distillation
$(ii)$ Glycerol from lye	$(b)$ Simple distillation
$(iii)$ The liquid with lower boiling point condenses first	$(c)$ Steam distillation
$(iv)$ The liquid with higher boiling point condenses first	$(d)$ Distillation under reduced pressure

Which one of the following mixtures can be separated by steam distillation technique?

On heating,some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as