Question

TUMLILJ! Give example of each.
e Mention two ways of separating soluble impurities from water.
9 Explain sedimentation and decantation.
How will you remove insoluble impurities from water through filtration.
14 What is distillation? Explain it with the help of a diagram.
B. Fill in the blanks.
comprises almost 21 per cent of the earth's atmosphere.
2. Air also has
and exerts
3. The air pressure
from place to place and it decreases as we go
water to stay healthy.
4. It is very important to consume
C. Tick the correct answer.
1. Which of these gases comprises 78 per cent of the atmosphere?
(a) Nitrogen
(b) Oxygen
(c) Carbon dioxide
2. Air supports combustion because it contains
(c) water vapour.
(b) oxygen.
(a) nitrogen.
3. Which of these is a purification technique for the removal of insoluble
c) Sedimentation and​

Answer 1

Answer:

78%nitrogen gas

air is cambustable because it has oxygen