In __________ combustion, a substance suddenly starts burning without any external cause.

slow

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rapid

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spontaneous

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non-spontaneous

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Solution

The correct option is C spontaneous
The type of combustion in which a material suddenly bursts into flames, without any external cause is called spontaneous combustion.

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Similar questions

Fill in the following blanks with suitable words :

(a) A fuel must be heated to its___ before it starts burning.

(b) The most common supporter of combustion around us is___

(d) A liquid fuel used in homes is___

(e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its___

(f) The substances which vaporise during burning, give___

(g) Burning of wood and coal causes___ of air.

Explain the following :

(a) The surrounding becomes pleasantly warm when water in a lake starts freezing in cold countries.

(b) The heat supplied to a substance during its change of state does not cause any rise in its temperature.

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