Answer: nitrates and phosphates.
- A dissolved oxygen
- B nitrates and phosphates
- C strong mineral acids
- D dissolved heavy metals
Correct answer: B. nitrates and phosphates
Explanation: Nutrient enrichment triggers algal blooms; their decay depletes oxygen and harms aquatic life.
Classical smog is a reducing mixture of SO₂ and fog, while photochemical smog is an oxidising mixture generated by UV-driven reactions of NOx and hydrocarbons.
Concept context
Understand how human activities alter the atmosphere, water, and soil. Covers air pollutants, smog types, ozone depletion, acid rain, greenhouse effect, water and soil pollution, and the principles of green chemistry.