103 CHEMISTRY

B TECH FIRST YEAR MODEL EXAMINATION

ENGINEERING CHEMISTRY Max marks:100

Time:3 Hrs

PART-A

1. a) Explain the Band Theory of solids.

b) Give a brief account on BET isotherm.

c) What are concentration cells? Give 1 eg

d) Explain the techniques to study fast reaction.

e) Derive the Kirchoff’s equation.

f) What is meant by chemical potential?

g) Give a short note on polymer additives.

h) Explain the manufacture , setting and hardening of port land cement.

PART-B

2. a) What are the polymer processing methods? Describe them.

b) What are nanometals & nanoceramics?

c) Mechanism of Lubrication.

OR

a) Explain the polymerization techniques.

b) Give a short note on 1) fullerenes & 2) optical fibres

c) What are the properties of a good refractory material?

3. a) Short note on a) Enthalpy b) Free energy c) Entropy

b) Derive the Gibb’s-Helmholtz equation.

c) Thermo dynamics of Bio chemical reactions.

OR

a) Derive an equation which shows the variation of free energy with equilibrium

constant.

b) Give note on 1) Fugacity 2) Heat of reaction

c) How entropy changes accompanies with an isobaric & isochoric process?

4. a) What are the different types of electrodes? Give example.

b) Give an equation relating activation energy & rate constant. Explain.

c)What are buffer solutions? Give eg.

OR

a) Derive the equation for the rate constant of a second order reaction.

b) Explain the polarization of a voltaic cell.

c) What are secondary cells? Explain the working of lead acid cell.

5. a) What are liquid crystals? Write the application of liquid crystals.

b) Short notes on 1) Free electron theory 2) Fermi level in semi conductors.

c) What are converitional and organic superconductors?

OR

a) What are the laws of absorption. Explain?

b) Short notes on 1) Chromophores 2) Auxochromes 3) Blue shift 4) Red shift

c) Explain the metallic solids? What are its properties? Give eg.