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Question

With increase in octane number:

A
cetane number decreases
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B
activation energy increases
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C
both A & B
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D
neither A nor B
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Solution

The correct option is C both A & B
Higher is the octane number higher is the activation energies. Activation energy is the amount of energy required to initiate combustion.
Cetane number is the fuel's eagerness to ignite from the heat created in the bore from the compression of the air. Higher is the cetane number lower is the octane number.

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