Question

Spontaneous combustion is a special case of combustion where a material burns without heat being supplied from an external source. For example, a piece of phosphorus suddenly starts burning when kept in a dish on a table.

What could be the LIKELY reason for spontaneous combustion to happen?

1 Non-metals absorb heat from the atmosphere more quickly than metals and are likely to combust spontaneously because of this.
2 Materials that combust spontaneously have a special property- they need not reach the ignition temperature to combust.
3 Spontaneous combustion is a process that requires only the presence of the combustible substance; heat and oxygen are not required.
4 In the case of substances that combust spontaneously, a chemical reaction takes place which generates the heat required for combustion.

Answer 1

Answer:

4.

Explanation:

In the case of substances that combust spontaneously, a chemical reaction takes place which generates the heat required for combustion. It also happens in case of a matchstick.