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Question
The combustion reaction which occurs on its own, without any external supply of heat is called as:
Options:
A .  Rapid combustion
B .  Spontaneous combustion
C .  Explosion
D .  Fire
Answer: Option B
:
B
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.

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