7.1 Composition of Air

Which of the following gases has the lowest composition in air?

• Nitrogen

• Oxygen

• Carbon dioxide

• Inert gases and other substances

_____ is a layer of air (gases) surrounding the Earth.

• Atmosphere

• Oxygen

• Nitrogen

• Carbon dioxide

_____ respiration is the process of obtaining oxygen from the atmosphere and eliminating carbon dioxide.

• External

• Internal

• Cellular

• Energy

Which of the following process does not need oxygen?

• Rusting

• Combustion

• Photosynthesis

• Respiration

_____ is used in astronaut's attire.

• Nitrogen

• Carbon dioxide

• Oxygen

• Inert gases

Oxygen combines with _____ chemically to form water.

• water

• hydrogen

• nitrogen

• carbon dioxide

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Oxygen cycle maintains the amount of _____ in the atmosphere.

• oxygen

• carbon dioxide

• nitrogen

• inert gases

Which of the following is a property of carbon dioxide?

• Colourful

• Supports combustion

• Does not dissolve in water

• An acidic gas

When carbon dioxide is present, lime water turns _____.

• Red

• Blue

• Green

• Cloudy

Tags

NGSS.MS-PS1-2

Carbon cycle maintains the amount of _____ in the atmosphere.

• oxygen

• carbon dioxide

• nitrogen

• inert gases

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3