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Sulphur dioxide is one of the components of polluted air. SO 2 is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO 2 is

1. 2SO 2 + O 2 → 2SO 3
2. SO 2 + O 3 → SO 3 + O 2
3. SO 2 + H 2 O 2 → H 2 SO 4
4. 2SO 2 + O 2 + 2H 2 O → 2H 2 SO 4

Correct answer: 2SO 2 + O 2 + 2H 2 O → 2H 2 SO 4

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