Question

7. Which of these is the purest form of water?
ill. Choose the correct option.
1. Which of these gases is present in highest percentage in air?
a. Oxygen
b. Carbon dioxide
c Nitrogen
d. Argon
2. Which of these gases keeps burning under control?
a. Oxygen
b. Nitrogen
C. Carbon dioxide
d. Ozone
xing
3. Which layer of the atmosphere merges with the space
a. Troposphere
b. Mesosphere
C Exosphere
d Thermosphere
4 Which of these properties of air enables us to drink from a straw?
a. Air has weight
b Air occupies space
c Air exerts pressure
d. Air supports burning
5. Adding which of these will help to increase the rate of sedimentation?
d Alum
a. Salt
b Sand
c Chlorine
& Which of these processes would you use to remove salt dissolved in water?
a. Sedimentation and decantation b Filtration
c. Evaporation
d. Chlorination
b. Decanted water​

Answer 1

Answer:

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Explanation:

nitrogen

carbon dioxide

exophere

air exerts pressure

alum

evaporation

Answer 2

Answer:

1.Nitrogen.

2.Oxygen.

3.Exosphere.

4.Air exerts pressure.

5.Alum.

6.Filtration.

Explanation:

Some of these answers should be wrong.