GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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Envlmnt No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
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Subject Code: 3133607 Date: 28/11/2019
Subject Name: Physical Chemistry
Time: 02:30 PM TO 05:00 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) Write a short note on emulsions. | 03 |
| (b) Give the characteristics of catalytic reactions. | 04 |
| (c) Draw TP phase diagram and explain phase, number of component and degree of freedom for the compound having same chemical formula in every phase. | 07 |
| Q.2 (a) Define the terms: Eutectic point & Eutectic mixture | 03 |
| (b) Enlist heterogeneous and homogeneous catalysis with suitable examples. | 04 |
| (c) What do you mean by parallel reaction? Give examples of it and derive an equation for it. | 07 |
| OR | |
| (c) Derive mathematical expression for the rate constant of a second order reaction. | 07 |
| Q.3 (a) Write a note on acid base catalysis. | 03 |
| (b) Explain working of Daniell cell with neat diagram. | 04 |
| (c) How will you differentiate between diffusion and effusion? If a gas X diffuses at a rate of one half as fast as oxygen, find the molecular mass of the gas. | 07 |
| OR | |
| Q.3 (a) Write a note on enzyme catalysis. | 03 |
| (b) Explain the role of salt bridge in electrochemical cell. | 04 |
| (c) Derive Young Laplace equation with importance of it. | 07 |
| Q.4 (a) Write a note on molecularity. | 03 |
| (b) Draw phase diagram of sulphur system and explain only degree of freedom on each phase. | 04 |
| (c) Explain measurement of Emf of an unknown cell with diagram: | 07 |
| OR | |
| Q.4 (a) What do you mean by half-life of a reaction. The half-life of a substance in a first order reaction is 15 minutes. Calculate the rate constant. | 03 |
| (b) Draw phase diagram of Ag-Pb system and explain only degree of freedom on each phase. | 04 |
| (c) Derive an expression for ?G, ?H in terms of emf of the cell and temperature coefficient of emf. | 07 |
| Q.5 (a) The following data obtained for the decomposition of N2O5 reaction: | 03 |
| t (mins) | 0 | 10 | 15 | 20 Vol of O2 evolved | 6.30 | 8.95 | 11.40 | 34.75 | |
| (b) Derive an equation for Isothermal reversible expansion work of an ideal gas. | 04 |
| (c) Derive Gibb’s Helmholtz equation in terms of internal energy and work function at constant volume. | 07 |
| OR | |
| Q.5 (a) Define surface tension, capillary action. How it plays an important role in bubble formation? | 03 |
| (b) Show thermodynamically that for an ideal gas Cp-Cv=R. | 04 |
| (c) Derive Gibb’s Helmholtz equation in terms of free energy and enthalpy change at constant volume. | 07 |
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