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combines with oxygen to form carbon dioxide water and energy.

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Important Questions on Air and Atmosphere

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Science>Chemistry>Air and Atmosphere>Air and its Components

Match the following:

  Column A   Column B
1. Oxygen a. Upper atmosphere
2. Carbon dioxide b. Factory chimneys
3. Water vapour c. Combustion
4. Smoke d. 0.03%
5. Ozone e. Humidity

 

EASY
Science>Chemistry>Air and Atmosphere>Air and its Components

Explain why a burning candle stops burning after some time when covered with an inverted gas jar.

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Science>Chemistry>Air and Atmosphere>Air and its Components
How will you show that air (or oxygen) is necessary for burning?
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Science>Chemistry>Air and Atmosphere>Air and its Components
How do plants and animals maintain the balance of oxygen and carbon dioxide gases in air (or atmosphere)?
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Science>Chemistry>Air and Atmosphere>Air and its Components
Explain why, if the clothes of a person catch fire accidently, he is covered with a woollen blanket. Give reason for your answer.
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Science>Chemistry>Air and Atmosphere>Air and its Components
Why do deep-sea divers carry oxygen cylinders with them?
EASY
Science>Chemistry>Air and Atmosphere>Air and its Components
How do earthworms breathe?
HARD
Science>Chemistry>Air and Atmosphere>Air and its Components

Study the picture and answer the questions.

Question Image

(i) Will the flame of the candle go out at once? Why or why not?

(ii) Will the water start boiling after some time? Why or why not?

(iii) Will the candle flame go out after some time? Why or why not?

(iv) If you hold the inverted glass jar so that it covers the candle flame but its rim is above the water level, what will happen?

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Science>Chemistry>Air and Atmosphere>Air and its Components
Explain how the oxygen in the air (or atmosphere) is replaced.
EASY
Science>Chemistry>Air and Atmosphere>Air and its Components
Which of the following is necessary for burning things?
Argon, Carbon dioxide, Oxygen, Nitrogen, Helium
HARD
Science>Chemistry>Air and Atmosphere>Air and its Components
How will you show that:
(i) air is present in a lump of soil?
(ii) air is dissolved in water?
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Science>Chemistry>Air and Atmosphere>Air and its Components
Explain why, a burning coal fire stops burning after some time when covered with a vessel.
EASY
Science>Chemistry>Air and Atmosphere>Air and its Components
How do aquatic animals like fish (which live in water) get oxygen required for breathing?
HARD
Science>Chemistry>Air and Atmosphere>Air and its Components
By a simple experiment, prove that air is essential for burning.
EASY
Science>Chemistry>Air and Atmosphere>Air and its Components
Which component of air acts as a supporter of combustion?
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Science>Chemistry>Air and Atmosphere>Air and its Components
How do the roots of land plants get oxygen for respiration?
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Science>Chemistry>Air and Atmosphere>Air and its Components
Is air present in water and in the soil?
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Science>Chemistry>Air and Atmosphere>Air and its Components
How is the balance of oxygen and carbon dioxide maintained in the atmosphere?
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Science>Chemistry>Air and Atmosphere>Air and its Components
How do animals that live in the soil get oxygen for breathing (or respiration)?
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Science>Chemistry>Air and Atmosphere>Air and its Components
Why are burrows and holes dug deep into the soil by the animals which live inside the soil?