Ozone in the stratosphere is deleted by

(1) CF₂Cl₂

(2) C₇F₁₆

(3) C₆H₆Cl₆

(4) C₆F₆

The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was :

Which of the following is not involved in the formation of photochemical smog?

Depletion of ozone layer causes

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

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