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 1

(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 CNG.