Atmosphere (Air)

Which one of the following pairs of gases are common air pollutants of the atmosphere?

• nitrogen and sulfur dioxide

• sulfur dioxide and argon

• carbon dioxide and nitrogen oxides

• carbon monoxide and methane

Which substance, present in car exhaust fumes, does not pollute the atmosphere?

• carbon monoxide

• nitrogen oxides

• nitrogen

• unburnt hydrocarbons

Is ozone an air pollutant?

• Yes, all the time.

• No, never.

• Yes, but only when it is at ground level.

• Under certain conditions, but it does not happen often.

Which of these pollutant gases in the air is mainly responbile for the greenhouse effect?

• carbon monoxide

• nitrogen dioxide

• carbon dioxide

• sulfur dioxide

The amount of oxygen in air is increased by

• rusting

• photosynthesis

• combustion

• respiration

Over 90% of air is made up of two gases ........ and ......... .

(a)  

• oxygen and nitrogen

• oxygen and carbon dioxide

• nitrogen and carbon dioxide

• nitrogen and argon

What is the pH of acid rain?

• 4.0

• 6.0

• 5.0

• 2.0

Air is a mixture of gases. Which method of separation is used to obtain nitrogen and oxygen in air?

• fractional distillation

• separating funnel

• simple distillation

• condensation

The most abundant noble gas in air is ........... .

• argon

• helium

• neon

• nitrogen

The simplest test for oxygen is to use

• litmus paper

• glowing splint

• limewater

• lighted splint