Anna University Model Question Paper BE I sem ENGINEERING MECHANICS Anna University Model Question Paper BE I sem CHEMISTRY-I

ANNA UNIVERSITY: CHENNAI 600 025

MODEL QUESTION PAPER

B.E./B.Tech. Degree Examinations

First Semester

CM 131    CHEMISTRY-I

Answer All Questions

 

PART – A (10 x 2 Marks  = 20 Marks)

 

1.

What is work function?

 

2.

Predict whether the following reaction is spontaneous at 25o C.

                       C( s ) + H2O( là   CO ( g) +  H2 ( g)

DH = 31.4 kcal /mole and DS = 32 cal /deg at 250C.

 

3.

What do you mean by steady state principle? Give one example for unimolecular reactions.  

4.

Explain parallel reaction with a suitable example.  

5.

What are reversible and irreversible cells?  

6.

Calculate the emf of the following cell at 250C

                     Zn( s)/Zn2+(0.1M)//Cu2+(1.75M)/Cu( s )

given that EoZn2+/ Zn =  -0.76V and EoCu2+/ Cu = 0.34V.

 

7.

A water sample contains 204 mg of CaSO4 and 73mg of Mg (HCO3)2 per

litre. What is the total hardness in terms of CaCO 3 equivalent?

 

8.

What is meant by reverse osmosis?  

9.

What are the functions of fillers and plasticizers in the plastic industry?  

10.

How is PVC prepared? What are its uses?

 

 
 

PART –  B (5 x 16Marks = 80 Marks)

 

 

11.i.

Derive the expression for van’t Hoff’s isotherm for the following general reaction:aA + bB à cC + dD.

6

ii.

Derive Gibb’s Helmholtz equation and discuss its applications.

6

iii.

At 623K, the equilibrium constant of the reaction

                                N2 + 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.

4

 

12.a) i.

Derive the expression for the kinetics of opposing reaction assuming first order in both the directions.

6

ii.

Discuss in detail the stationary and non-stationary chain reactions.

10

 

 

OR

 

 

 

  b)

 

 

Derive the expressions for

    i. Rate of enzyme catalysed reactions.

   ii. Rate constant of reactions in terms of thermodynamic functions.

 

 

 

 

8

8

13.a) i.

Explain the mechanism of hydrogen evolution and oxygen absorption in electrochemical corrosion. Illustrate with suitable diagrams.

10

ii.

Explain how sacrificial anode and impressed current methods control corrosion.

6

 

                                                                     OR

 

b)i.

Define the term single electrode potential.  Derive Nernst equation and give its applications.

8

ii.

How is calomel electrode constructed? Discuss how this electrode may be used for the determination of pH of a solution.

 

8

14.a)i.

Explain the various steps involved in the domestic water treatment.

10

ii.

How is the exhausted resin regenerated in an ion-exchanger? What are the merits and demerits of ion-exchange method?

6

 

                                                                    OR

 

b)i..

Explain the principle and procedure involved in the determination of permanent and temporary hardness by EDTA method.

12

ii.

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?

 

4

15.a) i.

Describe the method of preparation, properties and applications of bakelite, epoxy resins, PET and polyethylene.

10

ii.

Explain the compression and injection molding processes with neat sketches.

6

 
                                                                    OR

 

     b) i.

Give a detailed account of free radical and condensation polymerization.

10

       ii.

Define the term functionality of monomers. Explain its significance with suitable examples.     6

 

 

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