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By the end of 2002 the public transport of Delhi switched over to a new fuel. Name the fuel. Why is this fuel considered better? Explain.                                                                                           (3) 


CNG(Compressed  Natural Gas) is considered better because of the following reasons:

(i) CNG burns more efficiently unlike diesel or petrol.

(ii) Very little of it is left unburnt.

(iii) It can not adulterated.

(iv) It is cheaper than petrol or diesel.                                                                                (3)