Download GTU BE/B.Tech 2018 Winter 3rd Sem New 2133506 Physico Chemical Processes Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION - WINTER 2018

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Subject Code: 2133506 Date: 12/12/2018
Subject Name: Physico-chemical Processes
Time: 10:30 AM TO 01:00 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) Write a note on stability of colloids. 03
(b) Write a note on effect of temperature on reaction rate. 04

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(c) Write a short note on common ion effect with examples. 07

Q.2 (a) Explain acid base catalysis in details 03
(b) What do you mean by Oxidation-Reduction reaction? Explain half- 04
cell reaction with examples.
(c) Explain one component water system by neat and clean phase 07

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diagram.

OR

(c) Define the term buffer solution. Derive Henderson equation to find 07
out pH of buffer solution.

Q.3 (a) Define the term colloids. Give the classification of collides. 03

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(b) Derive Nernst equation showing effect of electrolyte concentration on 04
the potential of an oxidation-reduction electrode.
(c) Write a note on purification techniques of colloids. 07

OR

Q.3 (a) Define the term degree of freedom and explain it in details by taking 03

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suitable examples.
(b) Define the term electrochemical cell. Explain Daniel cell in details. 04
(c) Define the term chemical kinetics. Derive equation for second order 07
reaction.

Q.4 (a) Write a note on parallel reaction. 03

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(b) Write a note on quinonoid theory of indicators. 04
(c) Write a note on application of colloids. 07

OR

Q.4 (a) Explain promoters, inhibitors and catalytical poisoning with 03
examples.

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(b) The pH of a buffer solution containing 0.6 mole/litre of CH3COOH 04
and 0.5 mole/litre CH3COONa has been found to be 4.80. What will
be the pH of this solution after 0.1 mole/litre HCl has been added to
the buffer? Assume that the volume is unchanged. Ka = 1.75 x 10^-5,
(c) Explain adsorption theory of catalysis with suitable example. 07

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Q.5 (a) Draw phase diagram for four phase and one component system 03
(b) Find the pH of a buffer solution containing 0.10 mole per litre 04
CH3COONa and 0.12 mole per litre CH3COOH. Ka for acetic acid is
1.8 x 10^-5,
(c) Explain phase rule for two component system. 07

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OR

Q.5 (a) Explain the rate law, rate equation and order of reaction with suitable 03
examples.
(b) Derive relation between free energy and electro motive force. 04
(c) Explain heterogeneous catalysis with examples. 07

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