Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
Correct answer: C. Nitric acid plant
- A. Thermal power plant
- B. Petroleum refinery
- C. Nitric acid plant
- D. Sulphuric acid plant
Explanation
A nitric acid plant primarily emits nitrogen oxides, not appreciable sulphur dioxide, because sulphur compounds are not its main feed or reaction products. Thermal power plants, refineries and sulphuric acid plants can emit SO₂.
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