Acid rain occurs when sulfur dioxide in the atmosphere is oxidized in the presence of nitrogen dioxide. acid rain is an example of
a. a primary pollutant
b. a secondary pollutant
c. a tertiary pollutant
d. none of the above

The correct answer is option (b) a secondary pollutant.

The pollutants can be divided in two types, primary and secondary. The primary pollutants are those, who harm the atmosphere directly. The secondary pollutants are those, where the pollutants  combine in atmosphere and cause harm.

The sulfur dioxide is released into the environment through various processes. The released sulfur dioxide reacts with the atmospheric water and form sulfuric acid, which get mixed with the rain, causing acidic rain.

multiplying and dividing the two decimals and the eqations by the same number of the overalls