5. Which of the following is unlikely to be the pollutant from a sulphuric acid plant?
A. Acid mist
B. Sulphur dioxide
C. Hydrogen sulphide
D. Sulphur trioxide
5. Which of the following is unlikely to be the pollutant from a sulphuric acid plant?
A. Acid mist
B. Sulphur dioxide
C. Hydrogen sulphide
D. Sulphur trioxide