Question

The constituent of gasohol is:
A. 90% petrol + 10% alcohol
B. 80% petrol + 20% ethanol
C. 60 %petrol + 40 % ethanol
D. 50% petrol + 50% ethanol.

Answer 1

Hint: Gasoline which is also known as petrol is a mixture of volatile liquid hydrocarbons derived from petroleum and is used widely as a fuel for combustion engines, like automobile engines. The term petrol is used in India and the U.K. whereas gasoline is used in the U.S.

Complete step-by-step answer:
Step 1:
Octane rating is a measure of the fuel’s ability to resist any external knock. Octane does not enhance combustion but it prevents the air-fuel mixture inside an engine from getting ignited. The higher a fuel’s octane, the more is its resistance to knocking.

Step 2:
In gasohol 10% ethanol or ethyl alcohol is mixed with 90% petrol or gasoline to reduce the carbon monoxide released from the tailpipes of lead-free automobiles.

Step 3:
The alcohol which is blended in gasohol is not taken from petroleum, natural gas, or coal. The alcohol which is to be blended in gasoline has to be produced from renewable biomass. Hence, the ethanol which is used in gasohol is often obtained by fermenting crops or crop waste. Sometimes even methanol or wood alcohol is also used.

Step 4:
In some cities, gasohol is sold in place of gasoline to reduce air pollution.
Hence, the composition of gasohol is 90% petrol and 10% alcohol.
Option (A) is the correct option.

Note: Gasohol which is petrol along with alcohol is also a fuel and it should not be confused with gasoline which is pure petrol. Gasohol is used in certain places in place of gasoline or petrol to reduce air pollution.