Which one of the following is responsible for depletion of the ozone layer  in the upper strata of the atmosphere ?

(1) Polyhalogens

(2) Ferrocene

(3) Fullerenes

(4) Freons

Ozone layer is present in

The size of particulates of H₂SO₄ fog lies in the range

Which of the following is the coldest region?

The aromatic compound that is present as particulate among the following is : 

1. Benzene

2. Toulene

3. Nitrobenzene

4. Polycyclic hydrocarbons

A non-greenhouse gas is : 
1. CO₂
2. CH₄
3. Chlorofluorocarbons
4. O₂

Which of the following is true about photochemical smog?

The most abundant hydrocarbon pollutant is : 
1. Methane
2. Ethane
3. Propane
4. Butane

Which of the following is not considered to be a pollutant?

Chemical that has major part in acid rain is :