Question

EVALUATION
d. oxygen.
A. Choose the correct option.
1.
Which of the following is not a constituent of air?
a. Water vapour
b. Dust particle
c. Sodium
d. Smoke
2.
Which of the following is used as an oxidant in rocket fuel?
a. Helium
b. Liquid oxygen
c. Nitrogen d. Neon
3.
The gas that turns limewater milky is
a. hydrogen b. carbon dioxide.
c. nitrogen.
4. The constituent of air that supports combustion is
a. oxygen
b. carbon dioxide.
c. nitrogen d. helium.
5. Nitrogen is used in packaging of food because
a. it provides minerals to the food. b. it adds flavour to the food.
c. it keeps the food fresh.
d. it is easily available.
6. Which of the following is not an inert gas?
b. Radon
c. Neon
d. Hydrogen
7. Which of the following is not an air pollutant?
b. Oxygen
a. Carbon monoxide
d. Dust particles
a. Helium
c. Smoke
(TL)​

Answer 1

Answer:

1) Sodium .

2)Liquid oxygen

3)Carbon dioxide

4)Nitrogen

5)It keeps food fresh

6) Radon

7)Oxygen