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प्रश्न
List conditions under which combustion can take place.
उत्तर
Combustion is a process of reaction of a substance with oxygen. There are certain conditions required for combustion to take place. They are:
- Presence of a fuel
- Oxygen (in air) is essential for combustion.
- Ignition temperature (the lowest temperature at which a substance catches fire).
APPEARS IN
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
State whether the following statement is True/False.
Air is necessary for combustion.
People usually keep angithi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?
Write True/False against the following statement and also correct the false statement.
Increased concentration of nitrogen in air is believed to cause global warming.
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)
Any reaction that involves reaction with oxygen is called reaction ______.
Give one example of slow combustion.
Fill in the blanks using the word given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
The lowest temperature at which a substance catches fire is called its ______ temperature.
Fill in the blanks using the words given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ______.
