PDF chapter test TRY NOW
Long answer the following question:
Complete the crossword in the below 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)
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