A. Aug – Nov
B. Sep – Nov
C. Nov – Dec
D. Dec – Jan
Environmental Chemistry
Environmental Chemistry
A. Cl2
B. O3
C. ClO2
D. both B & C
A. Ammonia
B. Dissolved oxygen
C. Carbon dixide
D. All
A. 10
B. 100
C. 10000
D. 100000
A. DO
B. BOD
C. COD
D. all of the above
A. CO
B. NO2
C. both a & b
D. none of the above
A. SO3
B. CO
C. NO
D. H2SO4
A. dinitrogen oxide
B. nitrogen dioxide
C. chlorine gas
D. chlorine dioxide
A. volcanoes
B. electric sparks
C. combustion
D. all
A. ozone
B. carbonic acid
C. sulphuric acid
D. carbon dioxide
