(d) When water is heated, we see bubbles et
6. Name the processes which maintain the balance
between oxygen and carbon dioxide in the
7. State two similarities and two differences
8. Define rusting. What are the two necessary
conditions for rusting of iron? Give the chemical
EXERCISE - II
1. Name two important processes supported by
up
oxygen present in air
2. Give two uses of the following components
present in air
How is it done?
(a) oxygen
(b) nitrogen
(c) carbon dioxide (d) water vapour
between respiration and burning.
3. Define the following:
(a) Respiration (b) Photosynthesis,
(c) Combustion
name of rust.
4. What are fuels? Give two examples of modern fuels.
9. How is air useful to :
5. Give reasons
(a) water boats
(a) Aquatic animals and plants are able to
survive in water
(c) windmills
10. State the full form of LPG and CNG? How are
(b) A burning candle stops burning if covered
the two different in their composition ?
with a glass tumbler
(c) Mountaineers and divers carry oxygen
11. (a) Why is nitrogen important to all living beings!
cylinders with them.
(b) What is nitrogen fixation ?
(b) agriculture
(d) scooters and can
answer my questions and get to be marked brainliest and please tell me how to mark brainliest as i am new
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