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प्रश्न
Tick (√) the most appropriate answer.
The humans pollute the air by :
पर्याय
burning a vast amount of coal
burning waste materials
using petrol and diesel vehicles
all the above
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उत्तर
all the above
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संबंधित प्रश्न
Classify Carbon dioxide. Also give a balanced equation to prepare it.
Fill in the blanks
Plants and animals maintain the balance of carbon ___________and _________ in the air.
Give a reason why nitrogen is filled in food packets and not oxygen.
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 |
Compare respiration and combustion-both involving oxygen of the air.
Aerated water contains
______ is the main component of air.
Air contains a small amount of CO2, Water vapour, and some other gases like ______, etc.
Venus's atmosphere consists of roughly 96 – 97% of ______.
Explain the following observations very briefly
An empty glass in fact is not empty.
