Q 4. Fill in the blanks.
            (a) Fossil fuels are ____________, and __________ .
            (b) Process of separation of different constituents from petroleum is called_________ .
            (c) Least polluting fuel for vehicle is __________.

Answers (1)

(a) Fossil fuels are coal and natural gas.
(b) Process of separation of different constituents from petroleum is called refining .
(c) Least polluting fuel for vehicle is CNG (compressed natural gas).

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