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Give a reason why nitrogen is filled in food packets and not oxygen.
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State what would happen, if the air above the earth contained mainly oxygen and no nitrogen
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State the utility of oxygen for respiration in living organisms
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State the utility of oxygen for respiration in plants
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Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
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State a reason why there is a balance in the amount of carbon dioxide in the air, even though carbon dioxide is released into the atmopshere by various processes.
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Name three different appliances where air is utilized.
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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 |
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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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Complete the statement given below by filling in the blank with the correct word from the words given below
The ______ is a layer which extends up to about 10-50 km. above the earth.
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Complete the statement given below by filling in the blank with the correct word from the words given
___________is an example of a pollutant present in the air.
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Complete the statement given below by filling in the blank with the correct word from the words given:
The component of air used in photosynthesis is ______ and the products of photosynthesis is oxygen.
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Complete the statement given below by filling in the blank with the correct word from the words given:
The product formed which is common to both combustion and respiration is ______.
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Complete the statement given below by filling in the blank with the correct word from the words given:
The component of air which is variable in air above sea level and in air in general ______.
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Name the following:
The product formed when phosphorus burns in oxygen.
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Name the following:
The active component of air which supports combustion and is used up in burning
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Name the following:
The main, rare (inert) gas present in air.
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Name the following:
The component of air which is present more in industrial areas.
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Name the following:
The type of bacteria which directly absorb nitrogen from the air and converted soluble nitrates in the soil.
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Name the following:
The product of respiration released in exhaled air, other than carbon dioxide.
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