Cochin University of Science and Techology (CUST) 2007-1st Year B.Tech engineering chemistry - exam paper

BTECH DEGREE I&II SEMESTER exam MAY 2007
ENGINEERING CHEMISTRY

Time:3 Hrs Max marks:100



1.1) elaborate liquid crystals? provide its major applications.

2) discuss Frenkel defect & Schottky defect.
3) How do you discuss the acidic & basic nature of the subsequent substances
(i) HCLaq (ii) BF3 (iii) NaOHaq (iv) NH3

4) elaborate fast reactions? provide two eg & mention three methods to study fast reactions.

5) Derive Kirchoff’s formula.

6) What is free energy? How is it related to equilibrium constant?

7) discuss addition & condensation polymerization

8) What is an optical fibre? elaborate its advantage & applications?

Part B

2. a) Draw & tag Born Haber Cycle for Kcl.

b) compute the lattice energy of KCL using the provided data.
Enthalpy of formation = -438 KJ/mol
Enthalpy of sublimation = 89KJ/mol
Ionisation energy =425KJ/mol
Electron affinity =-355KJ/mol
Enthalpy of dissociation = 244KJ/mol

c) What is super conductivity? elaborate the applications of super conductors?
OR
3. a) How is band theory used to discuss conductor ,insulator,& semi conductor?

b) What is Fermi level?

c) elaborate intrinsic & extrinsic semi conductors?

4. a) describe order of a reaction . Derive the rate expression for 1st order reaction.

b) Apply the rate expression to obtain out an formula for half life of a 1st order
reaction.

c) In a 1st order reaction it takes 40.5 minutes for the reactant to be 25% decomposed.
compute the rate constant of the reaction. I n what time it will be 50% complete?
OR
5. a) What is corrosion?

b) Write notes on oxidation corrosion, corrosion by evolution of hydrogen & galvanic
corrosion.

c) What is sacrificial anodic protection method?

6. a) Derive a Gibb’s Helmholtz formula.

b) What is Troutn’s rule?

c) discuss Nernst heat theorem.
OR

7. a) What is enthalpy or heat content?

b) Show that change in enthalpy H=E+PV

c) provide various forms of statement of 2nd legal regulations of thermodynamics.

8. a) elaborate advantages of plastics?

b) Write short notes on thermo plastics.

c) discuss injection moulding.
OR

9. a) provide major properties of refractories.

b) elaborate the raw materials of Portland cement?

c) elaborate the applications of fullerene?
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Earning:   Approval pending.