Environmentalhard · Past Paper
Which chemical reaction represents the formation of acid rain from sulfur dioxide?
A$$SO_2 + H_2O \rightarrow H_2SO_3$$
B$$C + O_2 \rightarrow CO_2$$
C$$N_2 + 3H_2 \rightarrow 2NH_3$$
D$$2H_2 + O_2 \rightarrow 2H_2O$$
✓ Correct Answer: A — $$SO_2 + H_2O \rightarrow H_2SO_3$$
Sulfur dioxide reacts with water to form sulfurous acid ($$H_2SO_3$$), which then oxidizes to sulfuric acid ($$H_2SO_4$$).
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