Download GTU BE/B.Tech 2019 Summer 3rd Sem New 2133607 Physical Chemistry Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019

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Subject Code: 2133607 Date: 11/06/2019
Subject Name: Physical Chemistry
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Explain the role of salt bridge in electrochemical cell. 03
(b) Write a note on acid base catalysis. 04

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(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) Define the terms: Eutectic point & Eutectic mixture 03
(b) Enlist heterogeneous and homogeneous catalysis with suitable examples. 04

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(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 first order 07
reaction.

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Q.3 (a) Write a short note on surfactants. 03
(b) Explain working of any electrochemical cell with neat diagram. 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.

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OR

Q.3 (a) Write a note on molecularity. 03
(b) Write a note on enzyme catalysis. 04
(c) Derive Young Laplace & Kelvin equation. 07

Q.4 (a) Write a short note on emulsions. 03

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(b) Draw phase diagram of water system and explain only degree of freedom 04
on each phase.
(c) Explain collision theory in detail. 07

OR

Q.4 (a) What do you mean by half-life of a reaction. Derive equation for first order 03

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reaction.
(b) Define surface tension, capillary action. How it plays an important role in 04
bubble formation?
(c) What do you mean by parallel reaction? Give examples of it and derive an 07
equation for it.

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Q.5 (a) Write a short note on inhibitors. 03
(b) Enlist applications of supercritical CO2 (any four) 04
(c) Define the following terms with examples: 07
1. Supercritical fluid 2. Rate law 3. Entropy 4. Enthalpy
5. Micelle 6. Promoters 7. Adsorption

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OR

Q.5 (a) Explain Nernst equation with effect to temperature. 03
(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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