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Posted By: Atul Member Level: Diamond Posted Date: 01 May 2008
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2007 Anna University B.Tech Chemical engineering CH 242 — Physical Chemistry Question paper
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B.Tech. DEGREE EXAMINATION.
Fourth Semester
CHEMICAL ENGINEERING
CH 242 — Physical Chemistry
(Common to Textile and Leather Technology)
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A — (10 ´ 2 = 20 marks)
1. How much current is needed to deposit 2 g of chromium metal from a solution of in a period of 50 minutes?
2. What is the potential of a lead electrode that is in contact with a solution of 0.02 M in ions? The standard electrode potential for
is equal to 0.13 volt.
3. How is the phase diagram of a solid solution differs from the eutectic phase diagram?
4. How many number of phases, components and degrees of freedom are available in the following equilibrium?
5. How are colloidal metal and metallic sponge catalysts prepared?
6. Suggest a catalyst for the following reactions :
(a)
(b)
(c) n–Heptane Toluene
(d) Vegetable Oil Fat
7. What happens when solutions of sodium nitrate, barium nitrate and aluminium nitrate are separately added to 50 ml each of arsenic sulphide sol?
8. Distinguish between a dark reaction and a photochemical reaction.
9. What is called resonance fluorescence?
10. Define energy of activation.
PART B — (5 ´ 16 = 80 marks)
11. (i) Distinguish between physical adsorption and chemisorption. Discuss the characteristics of chemical adsorption. Explain an adsorption isotherm to reflect the characteristics of physical adsorption. (8)
(ii) Account for the low quantum yield in reaction. (8)
12. (a) (i) Write briefly on gaseous actinometer. (8)
(ii) Discuss the kinetics and mechanism of the photochemical reaction between Hydrogen and Chlorine. (8)
Or
(b) (i) State Beer’s law and mention its applications. (8)
(ii) A uranyl oxalate actinometer was irradiated for 20 minutes with a light of wavelength 4400 Å. At the end of this time, it was found that oxalic acid equivalent to 15 ml of 0.001 M potassium permanganate was decomposed by light. The quantum yield of this reaction was 0.52. Find the average intensity of light used in ergs per sec. (8)
13. (a) (i) Discuss the construction and working of the Hydrogen electrode. (8)
(ii) What is the potential of a copper–silver cell if the concentration is 1 ´ and the concentration is
1 ´ M. The standard potential of the cell is 0.46 V and the cell reaction is
(8)
Or
(b) (i) Derive Nernst equation and explain its significance. (8)
(ii) The equivalent conductance of at infinite dilution is
147.7 and the ionic mobilities of hydroxyl and chloride ions are 198 and 76.3 respectively. Calculate the equivalent conductance of at infinite dilution. (8)
14. (a) (i) Explain the catalytic functions of the following :
(1) Metals
(2) Semiconductors
(3) Insulators. (8)
(ii) What are carriers? How are they classified? Explain their catalytic functions with examples. (8)
Or
(b) (i) Account for the following :
(1) Adsorption is an exothermic process.
(2) In permanganimetric titration against oxalic acid, the first few drops of potassium permanganate takes more time for decolorisation.
(3) Arsenic oxide present in the platinised asbestos inhibit the rate of formation of sulpuric acid.
(4) Heterogeneous catalysis is the most widely used technique in industry. (8)
(ii) To which type of colloidal system, the following belong :
(1) Cu–Ni alloy (4) Mist
(2) Butter (5) Latex
(3) Milk of Magnesia (6) Smog (8)
15. (a) (i) Derive an expression for the second order rate constant for a reaction in which the reactants have the same initial concentration?
(8)
(ii) What is B.E.T. equation? Explain its significance. (8)
Or
(b) (i) Discuss the principle behind the Pattinson’s process of desilverisation of lead. (8)
(ii) Explain the term fractional distillation and mention its industrial utility. (8)
——————
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