Engineering Chemistry - 2 - December 2015
MU Chemical Engineering (Semester 4)
Total marks: --
Total time: -- INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary
Answer any Four of the following1(a) Explain the concept of electrical double layer using Helmholtz and Stern Model. 5 marks
1(b) Explain role of complexing agent in solvent extraction. 5 marks
1(c) What is the principle of amperometric titration? Explain the curve obtained in titration of Pb (II) ions againest sulphate inos. 5 marks
1(d) Write a note on glass electrode. 5 marks
1(e) What are catalyst? Explain how
(i) a promotor increases the activity of a catalyst.
(ii) a catalytic posion paralyses the activity of a reaction.
(iii) a catalyst remains unchanged chemically at the end of reaction. 5 marks
1(f) What is shielding and de-shielding? Explain the spliting of NMR signal.
(1) The NMR spectrum of C2 H4 Br has only signal. What is structure of the compound?
1(g) Explain Keto-enol tautomerism of ethylacetoacetate (EAA). Give synthesis of butanone from EAA. 5 marks
2(a) What is the principle of uv-visible spectroscopy? Given below are three organic compounds.
(iii) CH2=CH-CH=CH-CH=CH2 predict which one will absorb at longer wavelength and at shorter wavelength and why? 5 marks
2(b) Write a note on Enzyme Cataysis. 5 marks
2(c) Explain determination of solubility of sparingly soluble AgCl. 5 marks
2(d) What is Aromaticity? Explain aromaticity of anthracene. 5 marks
3(a) The distribution ratio for lodine between CHCl3 & Water is 420. If 100 cm3 of an aqueous solution containing 1.025 mg iodine is equilibriated with 50cm3 portions of CHCl3. What amount of Iodine will remain unextracted in water? Also calculate % extraction. 5 marks
3(b) What are colloids? Explain phenomenon of electro-osmosis. 5 marks
3(c) Explain in detail the technique of Thin-layer chromatography. How purity of aeatyl salicyclic acid is determined using same technique. 5 marks
3(d) Write a note on 'transport number' 5 marks
4(a) Explain principle of IR spectroscopy. Explain any two applications with suitable example. 5 marks
4(b) What are ion-exchange resine?
100% of common salt is passed through a cation exchanger in H+ form. Calculate weight of Hcl that will be formed. 5 marks
4(c) Discuss Debye-Huckel theory of strong electrolytes. 5 marks
4(d) How would you prepare the following compounds from diethyl malonate i) succinic acid ii) Barbitaric acid. 5 marks
5(a) Give the principle of Gas chromatography Mention its application. 5 marks
5(b) What are surfactants? Explain the application of surfactants in detergents. 5 marks
5(c) What is the principle of solvent extraction? Explain any one method in detail. 5 marks
5(d) Give prepartion of following compounds starting from acetoactic ester i) Adipic acid ii) 4-methyl uracil. 5 marks
6(a) Explain principle of conductometric titration. Mention its advantages & limitations. 5 marks
6(b) What are emulsions? Explain types of emulsions with suitable example. 5 marks
6(c) Compare UV & IR specrocsopy. 5 marks
6(d) Write a note on an 'Intermediate compound formation theory'. 5 marks