M.Sc. (Environmental Science) (Semester
(CBCS) Examination, 2017
ENVIRONMENTAL CHEMISTRY
Day Date: Thursday,20-04-2017 Marks: 70
Time: 10.30 AM to 01.00 PM
Instruction Attempt any five questions.
All Questions carry equal marks.
Question no.1 is compulsory
Attempt any two questions from Q.NO.2,3 and 4.
Attempt any two questions from Q.No.5,6 and 7.
Draw neat and labeled diagrams wherever necessary.
Q.1 Choose the correct answer: 14
Compound of which of the following element are generally present in
colloidal state in natural waters
Fe Si AL All
The alkalinity of natural waters is usually due to the presence of
HCO3 CO2
3 OH All
Which of the following is the source of carbon in aquatic environment
(oceans)
Living organism
Sedimentary carbonate material
Dissolved organic matter
Dissolved inorganic matter
All
Inorganic tin may undergo alkylation in aquatic environment to form
Monomethyl tin Dimethyl tin
Both None
Humic material in water may be found
In free form Complexes with metal ion
Complexed wit organic species All
Chlorine demand of water is equal toa)
Applied chlorine
Residual chlorine
Sum of residual chlorine
Difference of applied and residual chlorine
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Which of the chemical used for dechlorinationa)
Carbon oxide Bleaching Powder
Sulphur Oxide Chloramines
Standard BOD measures at
20C 25 C 30C 35 C
Which of the following process Contributes to CO2 into the atmosphere
Combustion Fermentation Putrefaction Fog All
10) Which of the following species results from photo insertion

2 NO+ All
11) Which of the following pollutants could be transported over long
distances
PAHs PCBs DDT All
12) Pesticides have been found to affect
Central nervous system Respiratory system
Digestive System All
13) Nitric oxide is generated into the atmosphere by
Forest fires Industrial heating
Domestic heating Internal combustion engines All
14) Liquids in gas aerosol are
Clouds Fog Mist Smog All
Q.2 What is integrated pest management? Add a note on Pheromones. 14
Q.3 What is photochemical smog. Add a note on its chemical reactions in
atmosphere.
14
Q.4 Explain in brief second law of thermodynamics with suitable examples. 14
Q.5 Write a short note on the following: 14
Lambert's Beer Law
Nernst distribution law
Q.6 Write a brief with suitable illustration on the following: 14
Cation and anion exchange
Soil profile
Q.7 Write the significance and importance of- 14
Micronutrients in soil
Carbonic acid system