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Question -

Fill in the banks. 
(a) Fossil fuels are ________, ________ and _________. 
(b) Process of separation of different constituents from petroleum is called _________. 
(c) Least polluting fuel for vehicles is __________.



Answer -

(a) Fossil fuels are __coal__, __petroleum__ and __natural gas__.

(b) Process of separation of different constituents from petroleum is called __refining__.

(c) Least polluting fuel for vehicles is __compressed natural gas (CNG)__.

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