Q.

Which of the following is not true?

Moderate

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Petrol containing a larger amount of straight-chain hydrocarbons produces less knocking

Petrol containing a larger amount of branched-chain hydrocarbons produces less knocking

Octane rating is zero for n-heptane

Octane rating is 100 for isooctane

answer is A.

(Detailed Solution Below)

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Detailed Solution

No, Petrol containing a larger amount of straight-chain hydrocarbons produces higher knocking( Sharp noises are produced when some of the compressed air-fuel combination in the cylinder burns prematurely. )

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