Anna University Question Paper – Chemistry – I SEM
ANNA UNIVERSITY: CHENNAI 600 025
MODEL QUESTION PAPER
B.E./B.Tech. Degree Examinations
CM 131 CHEMISTRY-I
Time: 3 Hours Max.Marks: 100 Answer All Questions
PART – A (10 x 2 Marks = 20 Marks)
What is work function?
|Predict whether the following reaction is spontaneous at 25o C.C( s ) + H2O( l ) à CO ( g) + H2 ( g)|
DH = 31.4 kcal /mole and DS = 32 cal /deg at 250C.
|What do you mean by steady state principle? Give one example for unimolecular reactions.|
|Explain parallel reaction with a suitable example.|
|What are reversible and irreversible cells?|
|Calculate the emf of the following cell at 250CZn( s)/Zn2+(0.1M)//Cu2+(1.75M)/Cu( s )|
given that EoZn2+/ Zn = -0.76V and EoCu2+/ Cu = 0.34V.
|A water sample contains 204 mg of CaSO4 and 73mg of Mg (HCO3)2 perlitre. What is the total hardness in terms of CaCO 3 equivalent?|
|What is meant by reverse osmosis?|
|What are the functions of fillers and plasticizers in the plastic industry?|
How is PVC prepared? What are its uses?
PART – B (5 x 16Marks = 80 Marks)
|Derive the expression for van’t Hoff’s isotherm for the following general reaction: aA + bB à cC + dD.|
|Derive Gibb’s Helmholtz equation and discuss its applications.|
|At 623K, the equilibrium constant of the reactionN2 + 3H2 ==== 3NH3|
is found to be 7.08×10-4. At 773K the constant is 1.45 x 10-5. Calculate DH of the equilibrium reaction, assuming that DH remains constant over this temperature range.
|Derive the expression for the kinetics of opposing reaction assuming first order in both the directions.|
|Discuss in detail the stationary and non-stationary chain reactions.|
|Derive the expressions for|
i. Rate of enzyme catalysed reactions.
ii. Rate constant of reactions in terms of thermodynamic functions.
|Explain the mechanism of hydrogen evolution and oxygen absorption in electrochemical corrosion. Illustrate with suitable diagrams.|
|Explain how sacrificial anode and impressed current methods control corrosion.|
|Define the term single electrode potential. Derive Nernst equation and give its applications.|
|How is calomel electrode constructed? Discuss how this electrode may be used for the determination of pH of a solution.|
|Explain the various steps involved in the domestic water treatment.|
|How is the exhausted resin regenerated in an ion-exchanger? What are the merits and demerits of ion-exchange method?|
|Explain the principle and procedure involved in the determination of permanent and temporary hardness by EDTA method.|
|A zeolite softener was 90% exhausted when 10,000 L of hard water was passed through it. The softner required 200 L of NaCl solution of strength 50g NaCl /L . What is the hardness of water?|
|Describe the method of preparation, properties and applications of bakelite, epoxy resins, PET and polyethylene.|
|Explain the compression and injection molding processes with neat sketches.|
|Give a detailed account of free radical and condensation polymerization.|
|Define the term functionality of monomers. Explain its significance with suitable examples.||6|