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Acid rain is caused by increase in the atmospheric concentration of:

1. SO3 and CO
2. CO2 and CO
3. O3 and dust
4. SO2 and NO2

Correct answer: SO2 and NO2

Solution

Sulfur dioxide and nitrogen dioxide react in the atmosphere to form sulfuric acid and nitric acid, which lower the pH of rain. Carbon monoxide, carbon dioxide, ozone, and dust do not primarily cause acid rain in the same way.

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