Thread: Chemistry Paper 2016
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Old Wednesday, March 09, 2016
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Default Chemistry Paper 2016
FEDERAL PUBLIC SERVICE COMMISSION
COMPETITIVE EXAMINATION -2016
FOR RECRUITMENT TO POSTS IN BS-17
UNDER THE FEDERAL GOVERNMENT

CHEMISTRY
Time Allowed: Three Hours
Part-I (MCQs): Maximum 30 Minutes
Part-I (MCQs): Maximum Marks = 20
Part-II: Maximum Marks = 80

Q 2. (a) What is Schrodniger wave equation? Discuss its importance in quantum chemistry. (6)
(b) Solve the Schrodniger wave equation for a particle in three-dimensional box and find the expression for the energy and wave function. (8)
(c) What is a well-behaved function? What are the requirements of a physically acceptable wave function? (6)

Q.3 (a) What is Gibbs free energy? Discuss its significance in chemistry. (6)
(b) Give a brief account of transition state theory indicating its advantages over collision theory. (8)
(c) Explain 3rd law of thermodynamics. How this law is useful to determine the absolute value of entropy? (6)

Q.4 (a) Define and explain Langmuir adsorption isotherm. What are its limitations? (8)
(b) What is acid-base catalysis? Discuss its significance in chemistry. (6)
(c) What is Phase rule? Discuss its application in one component system. (6)

Q.5 (a) What are solubility product and common ion effect? Discuss their significance in chemical analysis. (8)
(b) Valence shell electron pair repulsion theory can be used to predict the shapes of molecules. Using this theory explain the shapes acquired by BF3 and IF5. (7)
(c) Explain why HSH bond angle in H2S is slightly less than the tetrahedral angle 109.5. (5)

Q.6 (a) Describe main features of crystal field theory. How this theory explains colour of coordination complexes? (10)
(b) Write the electronic configuration for each of the following: (4)
Ni2+, Cu, Mn2+, Cr3+
(c) What is John-Teller theorem? Explain its significance in coordination chemistry. (6)

Q.7 (a) What are lanthanides? How are these extracted from their ores? (10)
(b) What is decay law? How half-life and decay constant are related with each other? (5)
(c) What types of statistical tests are employed in chemical analysis? (5)

Q.8 (a) What is solvent extraction? Explain its underlying principle with suitable examples. (7)
(b) What is electrophoresis? How is this technique useful to separate proteins? (7)
(c) What is TLC? Write some advantages of TLC over paper chromatography? (6)
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