GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION — WINTER 2018
Subject Code: 2131301 Date: 28/11/2018
Subject Name: Environmental Sciences I
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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) Differentiate between Distilled water and De-mineralized water. | 03 |
| (b) Define the terms: Valency, Accuracy, Drying & Desiccation. | 04 |
| (c) Mention the uses of following instruments/glassware: i) Hot Air Oven ii) Desiccators iii) Separating funnel iv) Laminar Air Flow v) Autoclave vi) conical flask vii) burette | 07 |
| Q.2 (a) Define Molarity, Molality and Normality. | 03 |
| (b) Generalized gas law based on which laws? Explain them. | 04 |
| (c) Explain the procedure of preparation of High purity water with neat sketch. | 07 |
| OR | |
| (c) Enlist the characteristic of Primary standard and Secondary standard chemicals. Give examples of them. | 07 |
| Q.3 (a) Explain procedure to standardize the secondary standard with one example. | 03 |
| (b) Explain the procedure to prepare following solution and mention whether it is primary or secondary standard. (a) 250 ml, 0.02M Na2CO3 (b) 1000 ml, 0.1M HCl | 04 |
| (c) Explain Mohr’s method for determination of Chlorides. | 07 |
| OR | |
| Q.3 (a) Explain the principle of Atomic Emission spectroscopy. Mention instruments based on Atomic Emission spectroscopy and draw a neat sketch of any one. | 03 |
| (b) Differentiate between Volumetric and Gravimetric analysis. | 04 |
| (c) State Henry’s law, Dalton’s law and Graham’s law. Highlight the application of any two of above laws in Environmental Engineering field. | 07 |
| Q.4 (a) Find out the pH of a mixture formed by mixing the following two solutions. Solution 1: Volume 300mL, pH =7 Solution 2: Volume 600mL, pH =5 | 03 |
| (b) Explain the need of Standard Methods for analysis of water and wastewater parameters? | 04 |
| (c) Explain the principal of potentiometric analysis. Enlist the electrode used in same and draw figure of any one type of electrode. | 07 |
| OR | |
| Q.4 (a) Enlist the instruments based on dispersion and scattering of light. Explain the principle of any one with neat sketch. | 04 |
| (b) Explain the principle of Infrared spectroscopy and UV-Visible spectroscopy. | 07 |
| Q.5 (a) Explain the procedure to determine the total hardness and calcium hardness along with the calculation of expression of result. | 03 |
| (b) Explain procedure of determination of alkalinity. | 04 |
| (c) Give classification of solids and explain any three types of solids. | 07 |
| OR | |
| Q.5 (a) Give classification of sampling techniques and explain each of them with their importance. | 03 |
| (b) Highlight the significance of pH in water and its impact on life of leaving beings. | 04 |
| (c) Highlight the significance of sulfate in water and wastewater. Calculate total hardness, total alkalinity, and carbonate hardness values for a wastewater having pH 7. Concentration of anions and cations are as follows: Calcium Ions: 60 mg/L, Magnesium: 20 mg/L ions, Sodium: 14.8 mg/L, Bicarbonate ions: 150 mg/L, Sulfate ions: 30 mg/L, and Carbonate ions : 110 mg/L | 07 |
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