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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.

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