Which of the following is true about oxygen?

(a)

Completely burning gas

(b)

Partially burning gas

(c)

Doesn’t support burning

(d)

Supports burning

Aerated water contains

(a)

air

(b)

oxygen

(c)

carbon dioxide

(d)

nitrogen

Solvay process is a method to manufacture

(a)

lime water

(b)

aerated water

(c)

distilled water

(d)

sodium carbonate

Which of the following is known as azote?

(a)

Oxygen

(b)

Nitrogen

(c)

Sulpher

(d)

Carbon dioxide

______ is called as vital life

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Oxygen

Nitrogen is ________ than air.

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lighter

Dry ice is used as a _________.

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refrigerent

Nitrogen

(1)

Fertilizer

Oxygen

(2)

Fire extinguisher

Carbon dioxide

(3)

Refrigerator

Dry ice

(4)

Respiration in living animals

What are the sources of oxygen?.

List out the uses of nitrogen

What is global warming?

What is dry ice? What are its uses?

Name the compounds produced when the following substances burn in oxygen.
a) Carbon
b) Sulphur
c) Phosphorous
d) Magnesium
e) Iron
f) Sodium

What are the effects of acid rain? How can we prevent them?

Soda bottle bursts sometimes when it is opened during summer. Why?

Why does the fish die when it is taken out of water

How do astronauts breathe when they go beyond earth’s atmosphere?