question_answer

  List three energy sources that are considered to be inexhaustible. State three reasons in support of your answer.

Answer:

                  The various components of a mixture should have different boiling points in case these are to be separated by fractional distillation. Fuel oil is the fraction of crude oil i.e., petroleum whose boiling point is above 350°C. It is used as a fuel in various industries to heat boilers because it does not leave any residue after burning.                                                   (1 +1 +1)