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 ${}^{\prime }90-Octane$ petrol' means that the petrol is as good as:

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

Answer 1

Answer: (C)

A mixture of $90$% iso-octane and $10$% normal (straight chain) heptane

90-Octane petrol is the mixture of 90% iso-octane and 10% normal (straight chain) heptane.

Hence option C is correct.