What is chromatography used for?

Which one of the following methods is suitable to separate a mixture of $n$-pentane and toluene?

Which substance is used in the purification of bone charcoal?

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

The fragrance of flowers is due to the presence of some steam-volatile organic compounds. These compounds are known as essential oils. At room temperature,these oils are insoluble in water but are miscible with water vapor. Name the suitable method for the extraction of these oils from flowers.

Explain the sublimation technique used for the purification of organic compounds.