A) 25
B) 50
C) 75
D) 100
Correct Answer: C
Solution :
The quality of a petrol can be expressed in terms of octane number. Octane number gives the percentage by volume of 150-octane in the mixture of iso-octane and n-heptane which has the same knocking property as the fuel under consideration. Hence, the octane number of a fuel which contains 25% n-heptane and 75% 150-octane will be 75.
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