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Posted By: neyha Member Level: Diamond Posted Date: 16 Jul 2008
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2005 Anna University B.E/B.TECH. DEGREE EXAMINATION :Chemistry I Question paper
B.E/B.TECH. DEGREE EXAMINATION ,APRIL/MAY 2005
First semester, (Common to all branches except marine engineering)
Chemistry I
Time:3 Hrs
Maximum: 100 marks
PART A (10 X 2 =20)
1.What are the conditions for a process to be spontaneous based on the relation ?G =?H-T?S
2.What is the significance of Gibbs Helmholtz equation ? What are its applications?
3.What is a composite reaction?Illustrate the various types of composite reaction with suitable examples.
4.The rate constant of a reaction at 25?C is 3.46 X 10 -5 s -1 . Calculate the Arrhenius factor at 25 ?C given that the activation energy Ea = 103.873 kJ/mol.
5.Suggest a method to determine the electrode potential of zinc.
6.What is pitting corrosion? Give an example.
7.What are zeolites ? Mention the advantages and disadvantages of zeolite process.
8.Why is it necessary to chlorinate drinking water supply beyond breaking point?
9.Discuss the steps involved in the addition polymerization by free radical mechanism.
10.What are the function of the following moulding constituents?
(a)Plasticizer
(b)Fillers.
PART B (5 X 16 =80)
11 (i) Write a detailed procedure for the determination of various forms of alkalinity.
(ii) Describe the desalination process by reverse osmosis.
12(a) (i) Deduce various expressions with E,H,A and G
(ii) Derive Maxwell relations with these expressions.
OR
(b)(i) By combining van’t hoff isotherm and gibbs Helmholtz equation illustrate the effect of temperature on equilibrium constant.
(ii) What are the applications of van’t hoff equation?
13 (a) (i) Derive a rate equation for unimolecular reaction using collision theory.
(ii) The half period of decomposition orf a compound is 60 min .If the initial concentration is halved ,the half period is reduced to 30 min.What is the order?
OR
(b)Derive the expression for the rate constants using (i) absolute reaction rate theory (ii) thermodynamic functions.
14 (a) Discuss the facors influencing electrochemical corrosion.
OR
(b) (i) How is EMF of a cell measured by poggendorff’s compensation method?
(ii) How is pH of a solution determined using glass electrode?
15 (a) With neat sketches describe injection and blow moulding processes
OR
(b) Write a note on the following:
(i) Bakelite.
(ii) PET
(iii) Epoxy resin
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