Combustion is the process in which a substance reacts with oxygen to give off heat. Example: a magnesium ribbon starts burning when heated in a flame. Given a combustible substance and oxygen, if the substance reaches its ignition temperature, it will start burning. Spontaneous combustion is a special case of combustion where a material burns without heat being supplied from an external source. Example: a piece of phosphorus suddenly starts burning when kept in a dish on a table. What could be the LIKELY reason for spontaneous combustion to happen?
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As magnesium being more reactive metal it reacts with oxygen spontaneously and burns spontaneosly
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phosphorus at room temperature starts buring due to coming in contact with air. so sodium and phosphorus are usually kept in kerosene to avoid its contact with air
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