Environmental Chemistry

Ozone hole is substantial depletion of ozone in every year during__________________? A. Aug – NovB. Sep – Nov C. Nov – Dec D. Dec – Jan

Which of the following is used as water disinfectant to avoid the formation of toxic compounds_________________? A. Cl2 B. O3 C. ClO2D. both B & C

A single chlorine free radical can destroy how many ozone molecules ? A. 10 B. 100 C. 10000D. 100000

Which of the following factors help to measure quallity of water ? A. DO B. BOD C. CODD. all of the above

Which of the following gases is the main cause of acid rain ? A. COB. NO2 C. both a & b D. none of the above

Which of the following is not primary pollutant__________________? A. SO3 B. CO C. NOD. H2SO4

The yellow colour in photochemical smog is due to presence of__________________? A. dinitrogen oxideB. nitrogen dioxide C. chlorine gas D. chlorine dioxide

Major cause of SO2 on global scale is__________________? A. volcanoes B. electric sparks C. combustion D. all

Which of the following is not a secondary pollutant_________________? A. ozone B. carbonic acid C. sulphuric acidD. carbon dioxide

Requirement of macronutrient per acre of the land is_________________? A. 5 to 200 kg B. 20-200 kg C. 200-400 kg D. 30-400 kg