Ocean acidification is the result of cars releasing
a. acid directly into the atmosphere
b. carbon dioxide that forms acid when it dissolves in water
c. sulphur dioxide that forms acid in the atmosphere
d. nitrogen oxides that form acid in the atmosphere

Answer is: b. carbon dioxide that forms acid when it dissolves in water.

Gasoline is a mixture of many different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins).

Reactio of gasoline combustion and forming carbon dioxide:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O.

Balanced chemical reaction of forming carbonic acid from carbon dioxide and water in the clouds: CO₂ + H₂O → H₂CO₃.

Fossil fuel combustion increases the acidity of rain.