Concept:Acid rain is mainly caused by pollutant gases that dissolve in rainwater to form acidic solutions.
Explanation:Nitrogen oxides, such as nitrogen dioxide (
NO2) and nitric oxide (
NO), are major contributors to acid rain.
These gases react with water, oxygen, and other chemicals in the atmosphere to form nitric acid.
Sulfur dioxide (
SO2) also causes acid rain by forming sulfuric acid, but it is not listed in the options.
Ozone, fluorine, and carbon(IV) oxide are not the primary pollutants responsible for acid rain.
Answer:A. Nitrogen oxides