Question

sometimes ph of acid rain is as low as 2.explain

Answer 1

Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic.

Answer 2

because of the presence of NO2 & SO2 gases. It react with rain water and form acid that's why they have low oh as low than 2.