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Combustion

When a fuel i...

Question

When a fuel is burned in air, it releases heat energy, water vapour and gas.

A

oxygen

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B

carbon dioxide

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C

nitrogen

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Solution

The correct option is B carbon dioxide
When a fuel is burnt, the oxygen present in the air reacts with carbon and hydrogen present in the fuel to form carbon dioxide and water vapour. The reaction involved is:
Fuel + Oxygen $\to$ Carbon dioxide + Water vapour + Heat
Carbon dioxide and water vapour so formed get released into the air.

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