Ozone hole is substantial depletion of ozone in every year during__________________?
A. Aug – Nov
B. Sep – Nov
C. Nov – Dec
D. Dec – Jan
Environmental Chemistry
Which of the following is used as water disinfectant to avoid the formation of toxic compounds_________________?
Which of the following is used as water disinfectant to avoid the formation of toxic compounds_________________?
A. Cl2
B. O3
C. ClO2
D. both B & C
A single chlorine free radical can destroy how many ozone molecules ?
A single chlorine free radical can destroy how many ozone molecules ?
A. 10
B. 100
C. 10000
D. 100000
Which of the following factors help to measure quallity of water ?
Which of the following factors help to measure quallity of water ?
A. DO
B. BOD
C. COD
D. all of the above
Which of the following gases is the main cause of acid rain ?
Which of the following gases is the main cause of acid rain ?
A. CO
B. NO2
C. both a & b
D. none of the above
Which of the following is not primary pollutant__________________?
Which of the following is not primary pollutant__________________?
A. SO3
B. CO
C. NO
D. H2SO4
The yellow colour in photochemical smog is due to presence of__________________?
The yellow colour in photochemical smog is due to presence of__________________?
A. dinitrogen oxide
B. nitrogen dioxide
C. chlorine gas
D. chlorine dioxide
Major cause of SO2 on global scale is__________________?
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_________________?
Which of the following is not a secondary pollutant_________________?
A. ozone
B. carbonic acid
C. sulphuric acid
D. carbon dioxide
Requirement of macronutrient per acre of the land is_________________?
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