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Carbon dioxide, at its usual concentration in the atmosphere (around 0.03%), is not regarded as a pollutant. However, when its levels increase, it contributes to global warming. Which of the following statements is accurate?

1. Nitrogen dioxide and sulfur dioxide react with atmospheric water to form nitric acid and sulfuric acid, leading to acid rain.
2. Carbon fluorides are the primary pollutants released by jet engines.
3. Most aquatic plants produce flowers that rise above the water surface and are pollinated by wind or insects, such as in water hyacinth and water lily.
4. Flowers of wind-pollinated plants are often small, lack petals, and do not have vivid colors, fragrances, or nectar. These plants generate large amounts of tiny pollen grains, which can cause allergies, unlike most animal-pollinated plants.

Correct answer: Nitrogen dioxide and sulfur dioxide react with atmospheric water to form nitric acid and sulfuric acid, leading to acid rain.

Solution

Option A is correct because NO2 and SO2 react with water in the atmosphere to form nitric acid (HNO3) and sulfuric acid (H2SO4), which contribute to acid rain. The other options are unrelated to the specific context of CO2 as a pollutant or global warming.

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