A gasoline with an octane rating of 90 would give the same performance in a standard test engine as a mixture of

Question

Quizplus · Accepted Answer

The octane rating of gasoline is determined by comparing its performance in a test engine with the performance of different blends of iso-octane and heptane. A rating of 90 indicates that the gasoline performs as well as a blend of 90% iso-octane and 10% heptane, which is the same as saying that the gasoline has the same resistance to knocking as this blend. Therefore, option A is the correct choice. Option B is incorrect because it suggests that heptane is the major component, which would result in poor performance in a standard test engine. Option C and D are also incorrect as they suggest equal parts of iso-octane and heptane or water, which would result in lower octane ratings and poor engine performance.

A Gasoline with an Octane Rating of 90 Would Give