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प्रश्न
Some words (underlined) in the following sentence is jumbled up. Write them in their correct form.
Some substances on combustion produce thea and mafel.
उत्तर
Some substances on combustion produce heat and flame.
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संबंधित प्रश्न
Give reasons.
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
True or False – If False give the correct answer
Oxygen is necessary for combustion
What is ignition temperature?
A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?
Some words (underlined) in the following sentence is jumbled up. Write them in their correct form.
Slaags is a non-combustible material.
State whether the following statement is True/False.
Air is necessary for combustion.
Complete the crossword 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)
Complete the oxidation reaction.
CH4+2O2 → ______+______+Heat energy.
Give one example of spontaneous combustion.
What do you mean by inflammable substance?
