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Spontaneous combustion is a phenomenon in which____________________?

Aall the fuel burns instantaneously producing high energy release
Bfuel burns with less air
coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
Dexplosion in furnace E. none of the above

Correct Answer: C. coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

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