Tropospheric pollution arises due to the presence of:

1.	SO2, SO3, and NO2, in the lowest layer of the atmosphere.
2.	SO2, SO3, and NO2, in the uppermost layer of the atmosphere.
3.	SO2, SO3, and NO2, in the middle layer of the atmosphere.
4.	All of the above.

Gases responsible for greenhouse effect are : 
1. Carbon dioxide (CO₂)
2. Ozone (O₃)
3. Nitrous oxide (N₂O)
4. All of the above.

Statues and monuments in India are affected by acid rain because of the formation of : 

The correct statement(s) regarding photochemical smog is/are:

The reaction/s involved during the formation of photochemical smog are:

\(1. \space NO_2(g) \rightarrow NO(g) + \stackrel{\cdot}{O(g)}\)

\(2. \stackrel{\cdot}{O(g)} + O_2(g) \rightarrow O_3(g)\)

\(3.\space O_3(g) + NO(g) \rightarrow NO_2(g) + O_2(g)\)

4. All of the above

The reaction(s) involved in ozone layer depletion in the stratosphere is/are:

1.
2.
3.
4.	All of the above

Consequence(s) of ozone hole is/are:

The major pollutant(s) of water pollution is/are:

1. Pathogens.

2. Organic waste.

3. Chemical components.

4. All of the above.

Biochemical Oxygen Demand (BOD) is-

The major source(s) of soil pollution is/are:

1. Industrial waste.

2. Fertilizers and pesticides.

3. Organic compost.

4. Both (1) are (2)