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27438645-Rr220803-Physical-Chemistry

27438645-Rr220803-Physical-Chemistry - Code No 24063 RR Set...

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Code No: 24063 RR Set No. 2 II B.Tech II Semester Supplimentary Examinations,February 2010 PHYSICAL CHEMISTRY Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ? ? ? ? ? 1. (a) Define nernst distribution law. (b) What are the conditions for the validity of the distribution law. (c) Prove that C 1 /C 2 = K D [2+6+8] 2. (a) What are the number of degrees of freedom, no. Phases for the following system i. One component ii. Two component iii. Three component [3+3+3] (b) What are the advantages and limitations of phase rule [7] 3. Discuss about liquids in solids (gels). [16] 4. (a) What are enzymes. How they are classified according to reactions. (b) Discuss the important factors that affect the enzyme-catalyzed reactions. [8+8] 5. (a) What is electrolysis? Explain the mechanism of electrolysis with example (b) Explain the first law of faraday law of electrolysis. [10+6] 6. (a) Distinguish between lyophilic and lyophobic colloids (b) Write short note on mechanical dispersion using colloidal mill. [8+8] 7. (a) The following mechanism has been suggested for the reaction i. 2NO == N 2 O 2 ii. N 2 O 2 +H 2 N 2 O + H 2 O iii. N 2 O + H 2 N 2 + H 2 O If the second step is rate-determining step what is rate law for this reaction? (b) Explain the following i. Upper and lower explosion limits ii. Thermal explosion limits. [8+8] 8. (a) What do you understand by the order and molecularity of a reaction? Derive an expression for the velocity constant of first order reaction. 1
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Code No: 24063 RR Set No. 2 (b) A solution of H 2 O 2 when titrated against KMnO 4 solution at different time intervals gave the following data time ( min ) 0.0 10.0 20.0 volume of KMnO 4 used for 10ml of H 2 O 2 23.8 14.7 9.1 Show that the decomposition of H 2 O 2 is first order reaction. [8+8] ? ? ? ? ?
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