Question

Which one is an example of rapid combustion

(i) Burning of charcoal pieces.

(ii) Kerosene oil wick stones

(iii) Burning of cow dung gases

(iv) Phosphorous catches fire in air​

Answer 1

Answer:

(iv) phosphorus catches on fire

Answer 2

burning of cow dung gases

burning of phosphorus is spontaneous combustion as Phosphorus catches fire when in contact to air without any specific reason