Oxygen

Oxygen molecule consists of ......... atoms

• one

• two

• three

................... act as catalyst in preparing O2

• Hydrogen

• Hydrogen peroxide

• Manganese dioxide

• (b) and ( c)

The most abundant gas in the atmosphere is ...............

• oxygen

• helium

• nitrogen

• carbon dioxide

Oxygen gas represents .........% of the Earth's atmosphere

• 0.03

• 78

• 12

• 21

Oxygen gas colourless, tasteless and odorless

• True

• False

Oxygen gas is easily dissolved in water.

• True

• False

Water molecule is formed from 1 oxygen atom and two hydrogen atoms.

• True

• False