There is air all around us. We can feel the presence of air around us but cannot see it. Air is a gas mixture. Air contains 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, and approximately 1% water vapour. Air is essential for breathing and burning. The presence of air is primarily responsible for the existence of life on Earth.
Plants play an important role in maintaining the balance of oxygen and carbon dioxide in the atmosphere through the process of photosynthesis.
Download PDF of Class 6 Chemistry Chapter 15 Air Around Us – Set 2
CBSE Class 6 Chemistry Worksheet Chapter 15 Air Around Us – Set 2
Q1. Which gas is essential for combustion?
a.) Oxygen
b.) Nitrogen
c.) Carbon dioxide
d.) Hydrogen
Q2. As we go higher in the atmosphere, the amount of oxygen ______.
a.) Decreases
b.) Increases
c.) Remain the same
d.) First increase, then decrease
Q3. The second most abundant gas in the atmosphere is ______.
a.) Oxygen
b.) Nitrogen
c.) Carbon dioxide
d.) None of the above
Q4. Fill in the blanks.
a.) ____ gas supports combustion.
b.) Plants use ____ gas during photosynthesis.
c.) The removal of water from plants in the form of vapour is called ____.
Q5. State true or false.
a.) Air is only made of nitrogen and oxygen.
b.) Air has a distinct smell.
c.) Plants use oxygen for respiration.
Q6. How will you illustrate that air dissolves in water?
Q7. What happens when burning continues in a closed room?
Q8. Describe the composition of air.
Q9. What is the function of a weathercock (wind vane)?
Q10. Are breathing and respiration the same thing?
Q11. It is recommended to wrap a woollen blanket around a burning object during a fire. Why?
Q12. Breathing through your mouth may be harmful.” How?
Q13. What will happen if CO2 levels in the atmosphere rise?
Q14. How is oxygen in the atmosphere or air replaced?
Q15. Give an experiment to demonstrate that one-fifth of the air is oxygen.
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