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प्रश्न
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.
विकल्प
True
False
उत्तर
This statement is False.
Correct Statement -
Increased concentration of carbon dioxide in air is believed to cause global warming.
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संबंधित प्रश्न
List conditions under which combustion can take place.
Combustion is a chemical reaction in which and substance react with ______.
A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?
The substance expected to have the highest ignition temperature out of the following is
A ______ process in which a substance reacts with ______ to give off heat is called combustion.
Fill in the blanks using the words given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
A chemical process in which a substance reacts with oxygen to give off heat is called ______.
People usually keep angithi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?
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)
Which of the following conditions is not necessary for combustion?
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 ______.
