Question

what is formed when sulfur dioxide and nitrogen oxides combine with water in the atmosphere?
a. acid rain
b. ozone
c. chlorofluorocarbon
d. particulate matter

Explanation:

Sulfur dioxide ($SO_2$) and nitrogen oxides ($NO_x$) react with water in the atmosphere to form sulfuric acid ($H_2SO_4$) and nitric acid ($HNO_3$), which dissolve in precipitation to create acid rain.

Answer:

A. acid rain