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Question

Which of the following is not true about combustion of hydrocarbons?

A
All hydrocarbons react in sufficient air to form carbon monoxide and then carbon dioxide
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B
Its always an exothermic process
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C
All hydrocarbons react in sufficient air to form carbon dioxide and water
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D
(b) and (c) above.
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Solution

The correct option is D (b) and (c) above.
In the presence of excess of air, complete combustion of hydrocarbon produces carbon dioxide and water as product
accompanied by evolution of a large amount of heat.
In order to achieve complete combustion, oxygen should be in excess.
for example : C3H8+5O23CO2+4H2O+Heat

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