M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Environmental Science
ENVIRONMENTAL CHEMISTRY
Time: 2½ Hours Max. Marks: 70
Instructions: Answer any five questions.
All questions carry equal marks.
Draw neat and labeled diagrams wherever necessary.
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
Compounds of which of the following element are generally present in
colloidal state in natural water.
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 with organic species All
Chlorine demand of water is equal to
Applied chlorine
Residual chlorine
Sum of residual chlorine
Difference of applied and residual chlorine
Which of the chemical used for dechlorination
Carbon di oxide Bleaching Powder
Sulphur oxide Chloramines
Standard BOD measures at
20 C 25 C
30 C 35 C
Which of the following process contributes to CO2 into the atmosphere
Combustion Fermentation
Putrefaction Fog
All
10) Which of the following species result 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 Answer the following any four:-
1. What is integrated pest management
2. Principle of second law of Thermodynamics
3. What is EI nino effect
4. Explain acid rain reaction in mesosphere.
5. What is Soil Fertility?
08
Write notes on (Any
1. Colloidal Solution
2. Soil air ad porosity
3. Reverse osmosis
06
Q.3 Answer the following Any
1. Explain the term Chemical equilibrium and chemical potential
2. What are the sources of heavy metals in atmosphere
3. Explain the theory of sedimentation
08
Answer the following any one
1. Adsorption
2. Soil salinity
06
Q.4 Answer the following Any
1. Phosphorus cycle
2. Structure of atmosphere
3. Soil profile
10
Answer the following any one
1. Explain the chemical processes for formation of organic particulate matter.
2. Explain the term BOD and COD.
04
Q.5 Answer the following. (Any two) 14
Microfiltration
Gibbs Energy Potential
Pesticide classification