Download GTU BE/B.Tech 2019 Summer 3rd Sem New 2133506 Physico Chemical Processes Question Paper

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Subject Code: 2133506

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Q.1 Write a note on effect of temperature on reaction rate. (03)

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   Q.2 Explain the rate law, rate equation and order of reaction with suitable examples. (04)

   Q.3 What do you mean by electromotive force? Derive the relation between free energy and EMF. (07)

2. Q.3 Derive Nernst equation showing effect of electrolyte concentration on the potential of an oxidation-reduction electrode. (03)

   Q.4 For a certain first order reaction t_0.5 is 100 sec. how long will it take for the reaction to be completed 75%? (04)

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   Q.5 Draw and explain the phase diagram of one component three phase system. (07)

   OR

   Write a note on purification techniques of colloids. (07)

3. Q.1 Explain promoters, inhibitors and catalytical poisoning with examples. (03)

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   Q.2 Explain any two method of dispersion to prepare sols. (04)

   Q.3 Define the term acid base catalysis. Give examples of acid base catalysis and explain their mechanism. (07)

   OR

   Define the term indicators. Explain any one theory of indicator. (07)

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4. Q.1 Write a note on parallel reaction. (03)

   Q.2 Define the term adsorption and explain adsorption theory of catalysis with suitable example (04)

   Q.3 What is the cell potential half-cell consisting of zinc electrode in 0.01M ZnSO4 solution at 25°C, E° =0.763V (07)

5. Q.1 Draw phase diagram for four phase and one component system (03)

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   Q.2 Explain Patterson’s process for desilversiation of lead from argentiferous lead. (04)

   OR

   Calculate the pH of 0.1 M acetic acid. Ka for acetic acid is 1.8 x 10^-7. (07)

6. Q.1 Define the term colloids. Give the classification of collides. (03)

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   Q.2 Define the term buffer solution. Derive Henderson’s equation to calculate pH of a buffer solution. The Ka of propionic acid is 1.34 x 10^-5. What is the pH of a solution containing 0.5 M propionic acid, C₂H₅COOH, and 0.5 sodium propionate, C₂H₅COONa. What happens to the pH of this solution when volume is doubled by the addition of water? (04)

   Q.3 Write a note on molecularity of reaction. (07)

7. Q.1 Explain relation between hydrolysis constant and degree of hydrolysis. (03)

   Q.2 What do you mean by condensed system? Explain phase rule for any one condensed system. (04)

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   OR

   Define the term half-cell reaction and give various examples of it. (07)

8. Q.1 Write a note on application of colloids. (03)

   Q.2 Explain second order reaction with example. (04)

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