Gases In The Air

What are the gases found in the air?

• Hydrogen, oxygen, carbon dioxide, noble gases and water vapour.

• Nitrogen, oxygen, carbon dioxide. noble gases and water.

• Hydrogen, oxygen, carbon dioxide and helium.

• Nitrogen, oxygen, carbon dioxide, noble gases and water vapor.

What is the percentage of nitrogen gas in the air?

• 1%

• 0.03%

• 20%

• 79%

What is the percentage of oxygen gas in the air?

• 1%

• 0.03%

• 20%

• 79%

What is the percentage of noble gases in the air?

• 1%

• 0.03%

• 20%

• 79%

What is the percentage of carbon dioxide gas in the air?

• 1%

• 0.03%

• 20%

• 79%

During photosynthesis, what gas do the plant take in?

• Hydrogen

• Nitrogen

• Carbon dioxide

• Oxygen

During breathing human take in __________________ gas and breathe out _________________ gas.

• hydrogen, oxygen.

• hydrogen, carbon dioxide

• oxygen, carbon dioxide

• carbon dioxide, nitrogen

Plants and animals use ________________________ gas for respiration.

• carbon dioxide

• oxygen

• hydrogen

• nitrogen

What gas is not present in the air?

• xenon

• carbon dioxide

• hydrogen

• carbon dioxide

Why hydrogen gas is not suitable for use airship?

• It is the lightest gas.

• It is not the lightest gas.

• It relight a glowing splint.

• It is highly flammable when react with oxygen.