JNTU Applied Chemistry and Bio-Chemistry Exam Paper Nov 2008
APPLIED CHEMISTRY AND BIO-CHEMISTRY, November 2008
1. (a) Define specific conductivity and molecular conductivity and what are the units
the express them.
(b) What are the differences between strong and weak electrolytes?
(c) A conductivity cell has two parallel electrodes of 1.50s2 cm area and 1.25cm
apart. When filled this with 0.1N solution of an electrolyte at 25oC, it offered a resistance of 2000 ohms. Calculate the cell constant and equivalent
conductivity of the electrolyte. [5+5+6]
2. (a) What are the properties of unplasticized PVC? What changes occur in it onplasticization?
(b) How is Teflon manufactured? What are its applications? [8+8]
3. (a) What are the specifications prescribed for drinking (potable) water?
(b) What is the purpose of sterilizing water? Describe various physical and chemical methods sterilization. [6+10]
4. (a) Distinguish between softening and demineralization of water.
(b) In the softening of water by the lime soda process, discuss the advantages of
hot lime soda process over the cold lime soda process.
(c) 100 ml. of water sample has hardness equal to 12.5 ml. of 0.18 N magnesium
sulphate. Calculate its hardness in ppm Units.
(d) What is the role of buffer in EDTA titration? [4+4+4+4]
5. (a) What are the differences between plant and animal cells?
(b) Explain the differences in the chemical composition of their cell walls. [8+8]
6. (a) What is meant by ‘Km’ value? Explain its significance.
(b) How the spectrophotometer is used to study enzyme Kinetics? 
7. Describe various mechanisms involved in transport of substances through biomembranes. 
8. Describe the electrophoretic representation of normal human plasma proteins and
add a note on the functions of various plasma proteins.