Cochin University of Science and Techology (CUST) 2011-2nd Sem B.Tech Computer Science and Engineering B tech I & ester(combined) 103 Engineering Chemistry - Question Paper

BTS(C)-1&n-n -026-B

B, Tech Degree I & II Semester (Combined) Examination June 2011

IT/CS/EC/CE/ME/SE/EB/EI/EE/FT 103 ENGINEERING CHEMISTRY

(2006 Scheme)

Time : 3 Hours    Maximum Marks : 100

PART A (Answer ALL questions)

I a) Differentiate between Frenkel and Schotky defects considering 5 points.    (8x5=40)

b)    Justify Ferro magnetism exhibited by solids on the basis of molecular field theory.

c)    Interpret the phenomenon of polarization in cells.

d)    Derive an expression for the rate constant of a second order reaction,

e)    Interpret the term *fligacity.

f)    State Troutons rule. Justify any two cases of deviations from Troulon's rule,

g)    Discuss the chcmistry of fuller* ncs.

h)    Discuss the manufacture, setting and hardening of Plaster of Paris.

PART B

(4x15=60)

II.    a) WhatisXPS?    (2)

b)    Why XPS is also called ESCA?    (4)

c)    List any two applications and explain why XPS is limited to surface study?    (4)

d)    Interpret the phenomenon of Chemical Shift giving 5 important points.    (5)

OR

III.    a) Explain band theory. Give relevant, labeled figures.    (4 /)

b)    Classify solids into three on the basis of their conductivity. Give appropriate (3x1 Vi =4/) labeled figures.

c)    Classify semiconductors and explain the mechanism of conduction in them.    (6)

Give relevant, labeled figures showing shift of Fermi level.

IV.    a) What are concentration cells? Write the genera] cell representation and cell    (2+3)

reaction for a Concentration celt.

b)    Derive the Nemst expression for the emf of Concentration cells.    (4)

c)    Apply the above to find the solubility of a sparingly soluble salt with labeled    (6) figure

OR

(P.T.O)

2

V.    a) Define Corrosion.    (2)

b)    Differentiate between sacrificial anodic protection and impressed current catholic (4+4) protection.

c)    Discuss the functioning of a H2-0: fuel cell with labeled figure.    (5)

VI.    a) Discuss the dependence of free energy change on Temperature at constant    (5)

pressure and derive Gibbs-Helmholtz equation.

b)    Discuss the dependence of free energy change on Pressure at constant    (5) temperature and derive vantHofTs Isotherm.

c)    Discuss the spontaneity of a chemical reaction considering free energy change as a (5) criteria.

OR

VII.    a) Derive Gibbs-Helmholtz Equation.    (5)

b)    Derive KirchoPTs equation.    (4)

c)    The standard heat of formation of liquid water is given    (6)

H₂(g)+ K Oj HjO(l)+68.3K Cal.

Calculate the standard heat of formation at 20C and also total change in heat capacities at constant pressure. Given;

The molar heat capacities at constant pressure in temperature range 20*25C of Hj(g) 6.89 Cal/degree/mole    0⁼ 6.97 Cal/degree/mole

HjOO) 8.0 Cal/degree/mole

VUI. a) What is meant by polymerization techniques?    (1)

b)    Differentiate between Solution polymerization and Emulsion polymerization    (4+4) technique.

c)    Brief on any three major classification of Nanomaterials.    (3x2=6)

OR

IX. a) What are lubricants? List any four properties of lubricants.    (1+4)

b)    Brief on Semisolid lubricants.    (3)

c)    Discuss Thick - Film (Fluid-Film) Lubrication mechanism.    (5)

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Earning:   Approval pending.