Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem New 2133607 Physical Chemistry Previous Question Paper
1
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
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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
degree of freedom for the compound having same chemical formula in
every phase.
07
Q.2 (a) Explain the role of salt bridge in electrochemical cell 03
(b) Enlist heterogeneous and homogeneous catalysis with suitable examples. 04
(c) Derive Gibb?s Helmholtz equation in terms of internal energy and work
function at constant volume.
07
OR
(c) Derive mathematical expression for the rate constant of a second order
reaction.
07
Q.3 (a) Define the terms: Eutectic point & Eutectic mixture 03
(b) Explain Daniel cell in detail. 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 molecularity. 03
(b) Find ?E, q and w if 2 moles of hydrogen at 3 atm pressure expand
isothermally at 50
0
C and reversibly to a pressure of 1 atm.
04
(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
on each phase.
04
(c) What do you mean by critical constants?Explain Andrew Isotherm of
carbon dioxide at different temperature.
07
OR
Q.4 (a) The half-life of a substance in a first order reaction is 15 minutes. Calculate
the rate constant.
03
(b) Write a note on Supercritical fluids. 04
(c) What do you mean by consecutive reaction? Give examples of it and
derive an equation for it.
07
Q.5 (a) Write a short note on promoters. 03
(b) Write cell reaction and also calculate E? of following cell:
Zn | Zn
2+
(0.001M) || Ag
+
(0.1M) | Ag
04
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1
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
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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
degree of freedom for the compound having same chemical formula in
every phase.
07
Q.2 (a) Explain the role of salt bridge in electrochemical cell 03
(b) Enlist heterogeneous and homogeneous catalysis with suitable examples. 04
(c) Derive Gibb?s Helmholtz equation in terms of internal energy and work
function at constant volume.
07
OR
(c) Derive mathematical expression for the rate constant of a second order
reaction.
07
Q.3 (a) Define the terms: Eutectic point & Eutectic mixture 03
(b) Explain Daniel cell in detail. 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 molecularity. 03
(b) Find ?E, q and w if 2 moles of hydrogen at 3 atm pressure expand
isothermally at 50
0
C and reversibly to a pressure of 1 atm.
04
(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
on each phase.
04
(c) What do you mean by critical constants?Explain Andrew Isotherm of
carbon dioxide at different temperature.
07
OR
Q.4 (a) The half-life of a substance in a first order reaction is 15 minutes. Calculate
the rate constant.
03
(b) Write a note on Supercritical fluids. 04
(c) What do you mean by consecutive reaction? Give examples of it and
derive an equation for it.
07
Q.5 (a) Write a short note on promoters. 03
(b) Write cell reaction and also calculate E? of following cell:
Zn | Zn
2+
(0.001M) || Ag
+
(0.1M) | Ag
04
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2
The standard potential for Ag/Ag
+
half cell is +0.80 V and Zn/Zn
2+
is -
0.76 V
(c) Show thermodynamically that for an ideal gas Cp-Cv=R. 07
OR
Q.5 (a) Explain term component. How many components are present in following
system:
i. Helium & Nitrogen
ii. Sodium chloride & Water
03
(b) Give the characteristics of catalytic reactions. 04
(c) Derive an expression for ?G, ?H in terms of emf of the cell and
temperature coefficient of emf.
07
.
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This post was last modified on 20 February 2020