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.Management Sciences
Category: Environmental Chemistry
The main pollutant of leather tanneries in the waste water is____________________?
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A. chromium III
B. chromium IV
C. chromium V
D. chromium VI
A single chlorine free radical can destroy how many ozone molecules ?
A. 10
B. 100
C. 10000
D. 100000
Major cause of SO2 on global scale is__________________?
A. volcanoes
B. electric sparks
C. combustion
D. all
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
In which of the following layer of atmosphere there is more thickness of ozone layer ?
A. troposphere
B. stratosphere
C. mesosphere
D. photosphere
Which of the following is not a condition for the formation of smog ?
A. sufficient NO
B. sunlight
C. less movement of air
D. winds
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 air pollutants is more dangerous for ozone layer ?
A. CFC
B. CO2
C. CO
D. Oxides of nitrogen
In the purification of portable water the coagulant used is_________________?
A. alum
B. nickel sulphate
C. copper sulphate
D. barium sulphate
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