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Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION — WINTER 2018
Subject Code: 2133607 Date: 05/12/2018
Subject Name: Physical Chemistry
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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) Write a short note on surfactants. 03
(b) Explain adsorption theory of catalysis with examples. 04
(c) Draw TP phase diagram and explain phase, number of component and 07 degree of freedom for the compound having same chemical formula in every phase.
Q.2 (a) Explain the role of salt bridge in electrochemical cell 03
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(b) Enlist heterogeneous and homogeneous catalysis with suitable examples. 04
(c) Derive Gibb’s Helmholtz equation in terms of internal energy and work 07 function at constant volume.
OR
(c) Derive mathematical expression for the rate constant of a second order 07 reaction.
Q.3 (a) Define the terms: Eutectic point & Eutectic mixture 03
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(b) Explain Daniel cell in detail. 04
(c) How will you differentiate between diffusion and effusion? If a gas X 07 diffuses at a rate of one half as fast as oxygen, find the molecular mass of the gas.
OR
Q.3 (a) Write a note on molecularity. 03
(b) Find ?E, q and w if 2 moles of hydrogen at 3 atm pressure expand 04 isothermally at 50°C and reversibly to a pressure of 1 atm.
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(c) Derive Young Laplace & Kelvin equation. 07
Q.4 (a) Write a short note on emulsions. 03
(b) Draw phase diagram of sulphur system and explain only degree of freedom 04 on each phase.
(c) What do you mean by critical constants? Explain Andrew Isotherm of 07 carbon dioxide at different temperature.
OR
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Q.4 (a) The half-life of a substance in a first order reaction is 15 minutes. Calculate 03 the rate constant.
(b) Write a note on Supercritical fluids. 04
(c) What do you mean by consecutive reaction? Give examples of it and 07 derive an equation for it.
Q.5 (a) Write a short note on promoters. 03
(b) Write cell reaction and also calculate E° of following cell: 04
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Zn | Zn2+ (0.001M) || Ag+ (0.1M) | Ag
The standard potential for Ag/Ag+ half cell is +0.80 V and Zn/Zn2+ is - 0.76 V
(c) Show thermodynamically that for an ideal gas Cp-Cv=R. 07
OR
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Q.5 (a) Explain term component. How many components are present in following 03 system:
- Helium & Nitrogen
- Sodium chloride & Water
(b) Give the characteristics of catalytic reactions. 04
(c) Derive an expression for ?G, ?H in terms of emf of the cell and 07 temperature coefficient of emf.
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