Question

The form of combustion where a material suddenly undergoes combustion under normal conditions is known as:

• A. fast combustion
• B. spontaneous combustion
• C. slow combustion
  
• D. non-spontaneous combustion

Answer 1

Answer: (B)

A type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is known as spontaneous combustion.

For some materials, ignition temperature is lower than the room temperature and hence, they readily catch fire even at room temperatures. Phosphorus is an example of such a material.

Hence, the form of combustion where material undergoes combustion at room temperature that is under normal conditions is known as 'Spontaneous Combustion'.

Hence, option B is correct.