Question

Method used to separate Petrol from crude oil is:

• A. chromatography
• B. fractional distillation
• C. substallisation
• D. Distillation

Answer 1

Answer: (B)

The complex mixture of hydrocarbons in crude oil can be separated into fractions by the technique of fractional distillation. The laboratory demonstration of the fractional distillation is illustrated on the right diagram. As the crude oil vapour ascends the fractionating column the highest boiling liquid hydrocarbons condense out and the lowest boiling hydrocarbon liquid's vapour exits the top of the fractionating column and enters the condenser and runs into the collection tube. In this way, we can distil over progressively higher boiling fractions, which are themselves narrow boiling point ranges of different hydrocarbons of similar carbon chain length e.g. C6 to C8 etc.
Hence, the process of separation of petrol from crude oil is given by option C,