Which region of the atmosphere is the domain of all living organisms?

The conversion of sulfur dioxide to sulfur trioxide in the absence of a catalyst is a slow process. However,this process occurs easily in the atmosphere. Describe how this happens and write the chemical equations for the formation of $SO_3$ from $SO_2$.

Fish die in water bodies polluted by sewage due to

Statues and monuments in India are affected by acid rain. How?

For dry cleaning of clothes,instead of tetrachloroethene,which is carcinogenic in nature,which of the following solvents can be used?

The statement "Ozone in the atmosphere is decreased by chlorofluorocarbons $(CF_2Cl_2)$" is: