Question

Complete the crossword figure with the help of the clues:

Across

1. Non-metal which catches fire if exposed to air. (10)

3. The lowest temperature at which a substance catches fire is called its ______ temperature. (8)

5. The most common fire extinguisher. (5)

Down

2. A chemical process in which a substance reacts with oxygen to give off heat. (10)

4. Petrol is used as a ______ in automobiles. (4) 

6. It is as hard as stone and black in colour. (4)

Answer 1

Across
1. Phosphorus

3. Ignition

5. Water

Down

2. Combustion

4. Fuel

6. Coal