Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3133607 Physical Chemistry Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3133607 Date: 28/11/2019
Subject Name: Physical Chemistry
Time: 02:30 PM TO 05:00 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 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 Deniell 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
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3133607 Date: 28/11/2019
Subject Name: Physical Chemistry
Time: 02:30 PM TO 05:00 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 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 Deniell 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
2
Q.5 (a) The following data obtained for the decomposition of N2O5
in CCl4 solution at 48
0
C,establish that this is a first order
reaction:
t (mins) 10 15 20
?
Vol of O2
evolved
6.30 8.95 11.40 34.75
03
(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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This post was last modified on 20 February 2020