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The tendency of petrol to detonate in terms of octane number is determined by comparison of fuel with which of the following?
  • a)
    Iso-octane
  • b)
    Mixture of normal heptane and iso-octane
  • c)
    Alpha methyl napthalene
  • d)
    Mixture of methane and ethane
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The tendency of petrol to detonate in terms of octane number is determ...
In the octane number test the performance of unknown gasoline is compared with that of series of reference fuels consisting of mixtures of iso-octane and normal heptane.
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The tendency of petrol to detonate in terms of octane number is determ...
Comparison with Iso-octane:
Iso-octane is a hydrocarbon compound known for its high resistance to knocking or detonation in an engine. It is assigned an octane rating of 100, which is the standard reference point for gasoline's octane rating scale.

Mixture of normal heptane and iso-octane:
Normal heptane, on the other hand, is highly prone to knocking. By blending different ratios of normal heptane and iso-octane, a scale was developed to compare the knocking tendency of different gasoline blends. The octane number indicates the percentage of iso-octane in a mixture that matches the knocking behavior of the fuel being tested.

Significance of Alpha methyl napthalene:
Alpha methyl napthalene is not typically used in determining the octane number of petrol. It does not serve as a standard reference point like iso-octane does.

Mixture of methane and ethane:
Methane and ethane are both light hydrocarbons that are not used in determining the octane number of petrol. These compounds do not exhibit the same knocking behavior as iso-octane or normal heptane.
In conclusion, the comparison of petrol with a mixture of normal heptane and iso-octane is crucial in determining its octane number. This scale helps consumers and engineers understand how prone a fuel is to detonation in an engine, allowing for the selection of appropriate gasoline for optimal engine performance.
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The tendency of petrol to detonate in terms of octane number is determined by comparison of fuel with which of the following?a)Iso-octaneb)Mixture of normal heptane and iso-octanec)Alpha methyl napthalened)Mixture of methane and ethaneCorrect answer is option 'B'. Can you explain this answer?
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