Science G6 unit 3

Which of the following gases is not one of the components of the atmospheric air

• Oxygen

• Nitrogen

• Carbon dioxide

• Ammonia

The main source of oxygen gas in air is process

• photosynthesis

• respiration

• combustion

• digestion

Hydrogen peroxide is used in preparing

• hydrogen gas

• oxygen gas

• nitrogen gas

• carbon dioxide gas

...............gas doesn't burn, but it helps in burning.

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

The rapid combination between oxygen and elements producing heat and light is called

• burning

• oxidation

• respiration

• reduction

Photosynthesis process depends on the presence of...............gas

• oxygen

• nitrogen

• carbon dioxide

• ozone

The percentage of carbon dioxide gas in air is.....

• 1%

• 0.03%

• 21%

• 78%

...........gas is prepared by adding dilute hydrochloric acid to calcium carbonate.

• Nitrogen

• Oxygen

• Carbon dioxide

• Neon

We can extinguish fire using ......... gas.

• carbon dioxide

• oxygen

• nitrogen

• hydrogen

Carbon dioxide gas is collected by..........

• upward displacement of air.

• upward displacement of water.

• downward displacement of air

• downward displacement of water