The flame of a kerosene oil lamp (or lantern) has:

If the clothes of a person working in the kitchen catch fire, then to extinguish the fire:

The outermost zone of a candle flame is the:

A lot of dry powder of one of the following chemicals can be released over a fire to extinguished it. This chemical is:

An electric spark is struck between two electrodes placed near each other in a closed tank full of petrol. Will the petrol catch fire. Explain your answer.