Which of the following statement regarding combustion of fuel is not true?

Fuels burn with the help of oxygen.

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Rate of combustion increases if supply of oxygen is less.

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Carbon-dioxide is formed during complete combustion.

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Soot is formed during partial combustion.

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Solution

The correct option is B
Rate of combustion increases if supply of oxygen is less.

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. During partial combustion of fuels, carbon monoxide, soot, and little of carbon dioxide are formed.

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