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

Carbon dioxide with water changes

(a)

blue litmus to red

(b)

red litmus to blue

(c)

blue litmus to yellow

(d)

doesn’t react with litmus

Which of the following is known as azote?

(a)

Oxygen

(b)

Nitrogen

(c)

Sulpher

(d)

Carbon dioxide

What are the sources of oxygen?.

Mention the physical properties of oxygen.

What is global warming?

What is dry ice? What are its uses?

What happens when carbon dioxide is passed through lime water? Write the equation for this reaction.

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

How does carbon dioxide react with the following?
a) Potassium
b) Lime water
c) Sodium hydroxide

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

It is said that sleeping beneath the tree during night is bad for health. What is the reason?