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Substances like phosphorus burns in air at room temperature. This type of combustion in which a material suddenly burst into flames, without application of any apparent cause, is called________.
1. Explosive combustion
2. Spontaneous combustion
3. Running combustion
4. Rapid combustion

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Correct Answer - Option 2 : Spontaneous combustion

The correct answer is Spontaneous combustion.

  • Spontaneous burning is when a substance catches fire as soon as its temperature reaches the ignition temperature.
    • White Phosphorus catches fire at room temperature of 35°C.

  • Explosion combustion reaction that takes place suddenly with the evolution of heat light and sound.
    • In this case, a large amount of gas is evolved which gets liberated.
    • When a cracker is ignited it suddenly reacts and bursts.
  • A rapid combustion is a form of combustion in which large amounts of heat and light energy are released.
    • This is used in a form of machinery, such as internal combustion engines, and thermobaric weapons.
    • The burning of LPG is an example of rapid combustion.

  • Hydrocarbon fuels can undergo complete combustion or incomplete combustion, depending on the amount of oxygen available.

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