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प्रश्न
Write ‘true’ or ‘false for the following;
The composition of air was discovered by Lavoisier.
पर्याय
True
False
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उत्तर
True
APPEARS IN
संबंधित प्रश्न
What do you observe when Calcium is heated and then tested with moist blue and red litmus – paper?
Tick (√) the most appropriate answer.
Which is not a polluting gas for the air?
Classify Calcium oxide. Also give a balanced equation to prepare it.
Give reason:
Mountaineers and divers carry oxygen cylinders with them.
Fill in the blank
Green plants need ________________to prepare food.
Match the statements in List 1 with the correct answers in List 2
| List 1 | List 2 | ||
| 1 | An impurity in air | A | Water vapour |
| 2 | The component of air which supports combustion | B | Respiration |
| 3 | The inert component in the air slightly soluble in water | C | Rare gases |
| 4 | The component of air which minimizes the rate of evaporation | D | Sulphur dioxide |
| 5 | The process which involves oxidation of food substance in living organisms | E | Helium |
| 6 | The component of air which finds application in observation balloons | F | Carbon dioxide |
| 7 | The process which involves oxidation of substances, liberating heat and light energy | G | Combustion |
| 8 | The component of air which is heavier than air and fairly soluble in water | H | Nitrogen |
| 9 | The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates | I | Photosynthesis |
| 10 | The component of air which is lighter than air and less than 1% in air | J | Oxygen |
How will you show that air is dissolved in water?
Air contains a small amount of CO2, Water vapour, and some other gases like ______, etc.
Make sentences using the given set of words.
99%, oxygen, nitrogen, air, together
Explain the following observations very briefly
Breathing through mouth may harm you.
