1. A chemical process in which a substance reacts with oxygen to give off heat is called:

2. Fuel may be:

3. The amount of heat energy produced on complete combustion of_____ fuel is called its calorific value.:

4. The substances which have very low ignition temperature and can easily catch fire with a flame are called:

5. When we heat water in a paper bowl over a candle, the paper doesnot catch fire because:

6. When oil or petrol catches fire, water is not used to extinguish it because:

7. In combustion:

8. A person caught fire on clothes is wrapped with blanket because:

9. Ignition temperature is:

10. Explosion takes place because of: