GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION - WINTER 2018
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Subject Code:2133505 Date:05/12/2018Subject Name:Chemistry for Environmental Science and Technology
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Define the term Environment. Explain biotic components of environment. 03
(b) Explain Le Chatelier’s principle with example. 04
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(c) Enlist the methods of DO measurements. Explain any one of them briefly. 07Q.2 (a) Define the followings: 03
1) Molecular Polarity 2) Cohesion
3) Oxidation reaction
(b) Discuss the phenomenon of photochemical smog with suitable diagram. 04
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(c) What is the principle of TOC analyzer? Discuss its working with suitable diagram. 07OR
(c) Define atmosphere. Draw a temperature Vs altitude profile of atmosphere and explain each segment of atmosphere. 07
Q.3 (a) Write a short note on greenhouse gas effect. 03
(b) Discuss the segments of environment. 04
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(c) What are the causes of taste and odour in water? Explain the measurement of taste and odour in water. 07OR
Q.3 (a) Enlist the various methods of disinfection. 03
(b) Discuss the sampling of wastewater. 04
(c) Define the term disinfection? Explain the chemistry involve in disinfection by chlorine. 07
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Q.4 (a) What are the discharge standards for following parameters as per CPCB: 03
pH, BOD, COD, Ammonical-N, Suspended solids, Oil & grease
(b) Define the term hardness. Discuss its types with environmental significance. 04
(c) Classify and discuss types of solids present in wastewater. 07
OR
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Q.4 (a) Write a short note on conductivity. 03
(b) Explain working principle of spectrophotometer. 04
(c) Discuss the sources of environmental toxicity. 07
Q.5 (a) Enlist chemical characteristics of wastewater. 03
(b) Discuss the working of zeolite based water softening unit. 04
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(c) How the excess amount of fluoride can be removed from drinking water. Explain with suitable diagram. 07OR
Q.5 (a) Discuss working principle of pH meter. 03
(b) Write short notes on coagulation and flocculation. 04
(c) What is the principle of flame photometer? Draw a working diagram and discuss its components. 07
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