Combustion can be defined as:

a process in which a substance combines with oxygen to produce light only.

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a process in which a substance combines with oxygen to produce heat and light.

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a process in which a substance combines with oxygen and carbon dioxide to produce heat and light.

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a process in which a substance combines with oxygen and carbon dioxide to produce heat.

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Solution

The correct option is B a process in which a substance combines with oxygen to produce heat and light.
Combustion is defined as a process in which a substance combines with oxygen to produce energy in the form of heat and light. For example, LPG (cooking gas) burns to give carbon dioxide, heat and a small amount of light.

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