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Pre-ignition of the fuel is seen in _________

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Pre-ignition of the fuel is seen in _________

(a) petrol knocking

(b) petrol cracking

(c) diesel cracking

(d) diesel knocking

This question was addressed to me in my homework.

Origin of the question is Cracking and Knocking of Petroleum topic in section Fuel Technologies of Applied Chemistry

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The correct option is (a) petrol knocking

For explanation I would say: Petrol knocking is due to the pre-ignition of the fuel and in diesel knocking is because of ignition-lag of the fuel.

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