Which of the following factors are essential to ignite a fire?

Heat

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Air (oxygen)

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Fuel

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All of these

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Solution

The correct option is D
All of these

To ignite a fire we need a combustible substance, fuel and heat energy. Burning is a chemical process that oxidizes a substance. Oxygen is necessary for combustion to occur. Hence all the three factors: air, fuel and heat are required for combustion to take place.

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