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Question

The incomplete combustion of petrol or diesel leads to the emission of which poisonous gas-
 
  1. Carbon dioxide
  2. Ozone
  3. Methane
  4. Carbon monoxide


Solution

The correct option is D Carbon monoxide
When petrol or diesel goes through the complete combustion then it forms carbon dioxide and water molecules.
2C8H18+25O216CO2+18H2O.
But when the supply of air/oxygen is poor then incomplete combustion occur. In incomplete combustion water is still produced, but carbon monoxide and un-burnt carbon particles are released instead of carbon dioxide. Carbon monoxide is a poisonous gas which can lead to many diseases.
In general, for incomplete combustion:
Hydrocarbon    +    oxygen      carbon monoxide   +   carbon   +   water.

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