A gas that is not common component of photochemical smog is-

1. Ozone

2. Acrolein

3. Peroxyacetyl nitrate

4. Chlorofluorocarbons

Green chemistry means such reactions that:

Among the following, the one that is not a greenhouse gas is:

1. Sulphur dioxide

2. Nitrous oxide

3. Methane

4. Ozone

The phenomenon in which atmospheric gases trap the heat radiations from the sun near the earth’s surface and keeps it warm is known as-

1. Natural greenhouse effect

2. Tyndall effect

3. Heating effect

4. Joule’s effect

The gas that damages the ozone layer is -

1. CFCs 

2. CO₂

3. CH₄ 

4. SO₂

The main air pollutant among the following is : 

1. CO

2. $C{O}_2$

3. $N_2$

4. Sulphur

Pollution can be controlled by-

1. Sewage treatment.

2. Checking atomic blasts.

3. Manufacturing electrically operated vehicles.

4. All of the above.

If water pollution continues at its present rate, it will eventually :

1. Stop the water cycle.

2. Prevent precipitation.

3. Make oxygen molecules unavailable to water plants.

4. Make nitrate molecules unavailable to water plants.

Domestic waste will lead to : 

1. Biodegradable pollution

2. Nondegradable pollution

3. Thermal pollution of soil

4. Air pollution

If a lake is contaminated with DDT, it's highest concentration would be found in :

1. Primary consumer

2. Secondary consumer

3. Tertiary consumer

4. None of the above.