Anna University Chennai 2006 B.E CHEMISTRY - 1 - Question Paper

13. (a) (i) elaborate the differences ranging from chemisorption and physical adsorption? [3 MARKS]

(ii) Derive Langmuir's adsorption isotherm. [5 MARKS]

(iii) discuss in detail, the role of adsorption in catalysis. [8 MARKS]

[OR]

(b) (i) elaborate catalyst promoters? [3 MARKS]

(ii) discuss the kinetics of acid-base catalysis. [5 MARKS]

(iii) Derive Michaelis Menten formula. [8 MARKS]

14. (a) (i) elaborate the general characteristics of a standard cell? [3 MARKS]

(ii) How is emf of a cell measured experimentally? [5 MARKS]

(iii) Construct the cells in which the subsequent reactions are taking place:
(1) Fe + CuSO4 --> FeSO4 + Cu
(2) Zn + H2SO4 --> ZnSO4 + H2
(3) Fe + SnCl2 --> FeCl2 + Sn
(4) (1/2)H2 + (1/2) Cl2 --> HCl [8 MARKS]

[OR]

(b) (i) describe the term standard electrode potential. [3 MARKS]

(ii) elaborate ion selective electrodes? discuss briefly the construction of an ion selective electrode,. [5 MARKS]

(iii) Derive Nernst equation:
compute the standard electrode potential of Ni/Ni^2+ electrode if the celll potential of the cell Ni/Ni^2+ (0.01 M)//Cu^2+(0.1)/Cu is 0.59 V, provided that E^0 Cu^2+/Cu = 0.34V. [8 MARKS]

15. (a) (i) State Beer Lambert's legal regulations and write its mathematical form. [3 MARKS]

(ii) discuss the main features of working of a colorimeter with a neat block diagram. [5 MARKS]

(iii) discuss an instrumental method for the quantitative determination of sodium ion in its solution.
[8 MARKS]

[OR]

(b) (i) elaborate the factors that influence the itnensity of spectral lines. [3 MARKS]

(ii) Write the principal of UV spectroscopy. [5 MARKS]

(iii) In a cell, the aqueous solution of a substance of known concentration absorbs 10% of the incident light. What fraction of the incident light will be absorbed by the identical solution in a cell 5 times as long? [8 MARKS]

Earning:   Approval pending.