GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-1 & II (NEW) EXAMINATION — WINTER 2019
Subject Code: 3110001 Date: 02/01/2020
Subject Name: Chemistry
Time: 10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.No | Question | Marks |
|---|---|---|
| Q1 (a) | Define hardness of water and differentiate between temporary and permanent hardness | 03 |
| (b) | Explain the principle of UV-VIS spectroscopy and list down main components of UV-VIS spectrophotometer. | 04 |
| (c) | Distinguish between addition and condensation polymerization and explain the mechanism of free radical addition polymerization. | 07 |
| Q2 (a) | Draw a well labeled diagram of fractional distillation of crude petroleum showing its various fractions. | 03 |
| (b) | Answer the following
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| (c) | What do you understand by ‘wet or electrochemical corrosion’? Explain mechanism of electrochemical corrosion. | 07 |
| OR | ||
| (c) |
| 07 |
| Q3 (a) | Outline the applications of nanotechnology in catalysis | 03 |
| (b) | State Lambert and Beer’s law and deduce its mathematical expression. | 04 |
| (c) | Differentiate between proximate and ultimate analysis of coal and explain proximate analysis giving its significance. | 07 |
| OR | ||
| Q3 (a) | What are the effects of nanoscale dimension on mechanical and optical properties of material? | 03 |
| (b) | Write a brief note on interaction of electromagnetic radiation with matter. | 04 |
| (c) |
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| Q4 (a) | What do you infer by following terms:
| 03 |
| Q4 (b) | Classify following as hard acid/base or soft acid/base: Li+, SCN- , Al3+, Sn2+, Au+, Pt2+ F-, OH-
| 04 |
| Q.5 (c) | Explain ethanol production using fermentation technology with a neat and labeled process flow diagram, showing all the steps involved. | 07 |
| OR | ||
| Q.5 (c) | Give an outline of Bottom up approach of synthesis of nanomaterial | 07 |
| Q.5 (a) | Answer the following:
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| (b) |
| 04 |
| (c) | Differentiate between ferrous and nonferrous alloys. | 07 |
| (a) | What are the draw backs of natural rubber? How are its properties improved? | 03 |
| (b) | Give a comparative account of Zeolite process and Ion exchange process used for softening of water. | 04 |
| (c) | Calculate temporary and permanent hardness in ppm, for a water sample, one litre of which show following result on analysis: Mg(HCO3)2 = 36.5 mg, Ca(HCO3)2 =40.5 mg, NaCl=16.7 mg, CaSO4 = 17 mg, and MgSO4 = 15 mg. | 07 |
| OR | ||
| (c) | Answer the following:
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| (a) | Explain the preparation, properties and any one specific use of the following polymers:-
| 03 |
| (b) | Write principle of softening of hard water by Lime soda process. | 04 |
| (c) | Calculate the quantities (in Kg) of lime and soda required to soften 50,000 liters of hard water containing the following salts:- MgCl2 =95 PPM; Mg(HCO3)2 = 146 PPM; CaSO4 = 136 PPM; Ca(HCO3)2 = 162 PPM. Assume that the lime used is only 85% pure and soda is only 95% pure. (Given: Atomic mass of Ca = 40; Mg = 24; H =1; O =16; S =32; C=12; Cl =35.5). | 07 |
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