Which of the following statement regarding combustion of fuel is true?

Carbon-dioxide is formed during complete combustion.

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Soot is formed during partial combustion of coal.

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Rate of combustion decreases if supply of oxygen is more.

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Fuels burn with the help of oxygen.

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Solution

The correct options are
A Carbon-dioxide is formed during complete combustion.
B Soot is formed during partial combustion of coal.
D Fuels burn with the help of oxygen.
Fuels burn with the help of oxygen. During complete combustion of fuels, carbon dioxide, steam, heat and light are formed. The rate of combustion decreases if the supply of oxygen is less because there isn’t enough oxygen to allow the fuel to react completely with the oxygen to produce carbon dioxide and water. This results in partial combustion of fuels. During partial combustion of fuels, carbon monoxide, soot, and little of carbon dioxide are formed.

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