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प्रश्न
The diagrams below represents an experiment to show the presence of a component of air.
- State why air is sucked from – outlet ‘B’ and not from outlet “A”
- State why the air is sucked ‘slowly’ from the outlet “B”
- State the observation seen after completion of the experiment.
- State the reason for the above observation seen.
- Name another component which if present in air as a pollutant would have given a similar observation
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उत्तर
- Because if we suck from ‘A’, lime water will be sucked out.
- Because if the air is sucked fast, lime water will also be sucked out.
- Lime water turns milky.
- The reason is the formation of CO2.
- Sulphur dioxide
संबंधित प्रश्न
Answer the question put against the following constituents of air :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
Complete and balance the following chemical equation.
CaO + H2O → ____________
What are the main components of air?
Fill in the blank
The reddish-brown powder on the surface of iron nails exposed to air and moisture is called _____.
Write ‘true’ or ‘false for the following;
Carbon dioxide is given out during photosynthesis
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 |
Why is carbon-dioxide gas used to extinguish fire?
The balance of oxygen in atmosphere is maintained through photosynthesis in animals and respiration in plants.
______ exists in nature as silicates, carbonates, oxides, and water. It also exists in a free state as part of the air in the atmosphere.
State whether the following statement is true or false. If false, correct them.
Plants consume oxygen for respiration.
