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  4. A fuel containing 25 % n-heptane and 75 % iso-octane has got octane number:

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Q. A fuel containing $25\%$ n-heptane and $75\%$ iso-octane has got octane number:

J & K CETJ & K CET 2000

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 $75 .$