The combustion reaction which occurs on its own, without any external supply of heat is called as:
A
Rapid combustion
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B
Spontaneous combustion
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C
Explosion
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D
Fire
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Solution
The correct option is B Spontaneous combustion The type of combustion in which a material suddenly bursts into flames, without any external heat supply is called spontaneous combustion. For example, substances like phosphorus and sodium burn when kept open at room temperature.