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Science Question on Petroleum

Fill in the blanks:

  1. Fossil fuels are ___, ___ and ___.
  2. Process of separation of different constituents from petroleum is called ___.
  3. Least polluting fuel for vehicle is ___.
Answer

(a) Fossil fuels are Natural Gas , Coal and Petroleum.
(b) Process of separation of different constituents from petroleum is called refining.
(c) Least polluting fuel for vehicle is CNG.