Air and atmosphere

Which of the following gas is not an air pollutant?

• Nitrogen

• Carbon dioxide

• Oxygen

• Carbon monoxide

About 78% by volume of air is

• Oxygen

• Carbon dioxide

• Nitrogen

• Krypton

A gas which neither burns nor supports combustion is

• Oxygen

• Nitrogen

• Carbon

• Hydrogen

A fire extinguishers, the gas used is

• Hydrogen

• Nitrogen

• Carbon dioxide

• Carbon monoxide

Carbon dioxide gas is

• Lighter than air

• Heavier than air

• As heavy as air

• None of these

Respiration andrusting are example of

• Rapid combustion

• Slow oxidation

• Combustion

• None of these

The rain which has harmful effect on buildings is called

• Acid rain

• Basic rain

• Neutral rain

• None of these

Rust is -

• Hydrogen peroxide

• Hydrated iron Oxide

• Iron sulphate

• Iron oxide

Who is given the credit of discovering oxygen gas?

• Lavoisier

• Robert Hooke

• Joseph priestly

• None of these

Which among the following is not an example of oxidation

• Photosynthesis

• Respiration

• Rusting

• Burning