Question
Crude oil is purified using fractional distillation process. This method works on the principle of:

Answer

  1.  Differences in the boiling points of the components
Explanation:
The different hydrocarbon components of crude oil are called fractions.
The fractions are separated from one another using a process called fractional distillation.
This process is based on the principle that different substances boil at different temperatures. 
 

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