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Question

90 Octane Petrol is a rating that indicates that the petrol in the engine would not waster its energy in making a 'knocking sound', but would rather use its energy efficiency to maintaining speed for travel 90Octane petrol' means that the petrol is as good as:

A
90% octane
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B
90% normal heptane and 10% iso-octane
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C
A mixture of 90% iso-octane and 10% normal (straight chain) heptane
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D
90% petrol
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