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2003 Course Interface & Colloid Science (Elective I)

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Total No. of Questions : 8] [Total No. of Pages : 2 [3664] - 327 P 1355 B.E. (Petrochemical) INTERFACE & COLLOID SCIENCE (Elective - I) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Q2) a) b) c) Explain surface tension as excess surface free energy. [6] Calculate the minimum work required to be done in order to produce a spray of water of droplet diameter 1000 nm from 50 lit of water at 25oC. Assume all droplets to be of same size. (Surface tension of water = 0.072 Nm-1) [6] Discuss industrially important applications for the following interfaces : i) Solid-vapour. ii) Liquid - Liquid. [4] Discuss how surfactants are classified. Give two examples from each class. [6] Explain how dodecane is converted into a useful surface active molecule.[6] Discuss thumb rules for biodegradibility of any given surfactant. [4] Q3) Explain in detail : a) London - Vanderwaal forces. b) Electrical Double Layer. [16] Q4) Write notes : a) Electro phoresis. b) Sources of interfacial charge. c) Principle of Surface Tensiometer. [18] P.T.O. SECTION - II Q5) a) b) c) Q6) a) b) Explain why clay suspensions are stable and how an electrolyte addition affect their stability. Give examples. [6] Briefly discuss relevance of colloidal stability in use of drilling mud in crude oil production. [4] Discuss main features of DVGO theory. [6] Explain Gibbs Adsorption equation and its significance. [6] An aqueous solute adsorbs at a surface according to the Langmuir equation : x bc = x m 1 + bc Where x m i s the maximum possible amount adsorbed. Assume x/xm = 0.4 at c = 0.1 M. Estimate the value of interfacial tension for c = 0.1 M solution at the surface. Assume molecular area of solute as [10] 0.2 nm2 and operating temperature as 30oC. Q7) a) b) c) Explain the role of surfactant flooding in enhanced oil recovery. [6] Discuss the possible reasons behind thermodynamic stability of micro emulsions. [6] Explain the principles involved in detergency action. [6] Q8) Write notes (Any Four) : a) Emulsion polymerization. b) Significance of HLB. c) BET method for determining area of porous catalyst. d) Chemisorption and Heterogeneous catalysis. e) Laplace Young Equation. [3664] - 327 -2- [16]

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