Which of the following has the lowest ignition temperature ?

• petrol

• kerosene

• coal

• LPG

Burning of fossil fuels causes pollution. Comment.

The substances which have very low ignition temperature will

• catch fire easily

• will not catch fire

• catch fire after some time

• none of the above

Coal burns with

• flame

• only glow

• both flame and glow

• none of the above

At airports and petrol pumps hydrocarbon fire extinguishers are used, not the soda-acid fire extinguisher. Why ?