Why does spontaneous combustion occur in some substances?

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hi aayushi,

 A substance that can spontaneously catch fire  at room temperature has the sufficient energy required to overcome the energy of the reaction. Therefore the reaction continues until completion.eg;white phosphorus.

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these substances have a low ignition temperature and thus, they easily obtain the required temperature and burns at room temperature.

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 THEY ALSO HAVE LOW IGNITION TEMPERATURE

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ANS: Spontaneous combustion is a type of  combustion which occurs without an external ignition source.

E.g. Spontaneous  combustion of coal : Spontaneous combustion of coal is the process of self heating resulting eventually in its ignition without the application of external heat. Coal when exposed to air absorbs oxygen at the uncovered surface. Some fraction of the exposed coal substance absorbs oxygen at a faster rate than others and the oxidation results in the formation of gases. Mainly CO, CO2, water vapor along with the evolution of heat during the chemical reaction. If the rate of dissipation of heat is slow with respect to the evolution of heat by oxidation there is a gradual build up of heat and temperature reaches the ignition point of coal thereby causing fire.

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