EASY
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There is more in the air than any other gas.

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Important Questions on Air Around Us

MEDIUM
Science>Chemistry>Air Around Us>Presence of Air Around Us
Which of the following is not a pollutant?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
Which component of air acts as a supporter of combustion?
MEDIUM
Science>Chemistry>Air Around Us>Presence of Air Around Us
Why do plants need nitrogen?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
Which gas in the atmosphere is essential for respiration?
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Science>Chemistry>Air Around Us>Presence of Air Around Us

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

EASY
Science>Chemistry>Air Around Us>Presence of Air Around Us
Which of the following is necessary for burning things?
Argon, Carbon dioxide, Oxygen, Nitrogen, Helium
MEDIUM
Science>Chemistry>Air Around Us>Presence of Air Around Us
Explain why, if the clothes of a person catch fire accidently, he is covered with a woollen blanket. Give reason for your answer.
EASY
Science>Chemistry>Air Around Us>Presence of Air Around Us
The air that we breathe in is rich in carbon dioxide.
MEDIUM
Science>Chemistry>Air Around Us>Presence of Air Around Us
How will you show that air (or oxygen) is necessary for burning?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
Name the two main gases present in the air.
EASY
Science>Chemistry>Air Around Us>Presence of Air Around Us
Name the major component of the air
MEDIUM
Science>Chemistry>Air Around Us>Presence of Air Around Us
What is the importance of water vapour in the air?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
Which gas is given to the patients having breathing problems?
MEDIUM
Science>Chemistry>Air Around Us>Presence of Air Around Us
Plants use carbon dioxide from the air for photosynthesis. How is the carbon dioxide in the air (or atmosphere) replaced?
MEDIUM
Science>Chemistry>Air Around Us>Presence of Air Around Us
When it rains heavily, it is easy to find earthworms in the garden. Why?
EASY
Science>Chemistry>Air Around Us>Presence of Air Around Us
Apart from nitrogen and oxygen, name two other gases present in the air.
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Science>Chemistry>Air Around Us>Presence of Air Around Us
Name the component of air which condenses on a cold surface to form drops of a liquid. What is this liquid?
EASY
Science>Chemistry>Air Around Us>Presence of Air Around Us

Which gas is needed for fire to burn?

HARD
Science>Chemistry>Air Around Us>Presence of Air Around Us

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?

EASY
Science>Chemistry>Air Around Us>Presence of Air Around Us
Name any one component of air which does not support burning.