Hamad Environmental Chemistry 17/11/2021 A. DO B. BOD C. COD D. all of the above Related Mcqs: Newspaper can be recycled again and again how many times ?A. 2 B. 3 C. 4 D. 5... The main pollutant of leather tanneries in the waste water is____________________?A. chromium III B. chromium IV C. chromium V D. chromium VI... Which substance can be used for disinfecting water ?A. KMnO4 B. Alums C. Ozone D. All... The yellow colour in photochemical smog is due to presence of__________________?A. dinitrogen oxide B. nitrogen dioxide C. chlorine gas D. chlorine dioxide... Which of the following is not primary pollutant__________________?A. SO3 B. CO C. NO D. H2SO4...
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