SINDH PUBLIC SERVICE COMMISSION, HYDERABAD.
Combined Competitive Examination, 2020
CHEMISTRY
Thursday the 19th November, 2020.
Time: 02:00 pm to 05: 00 pm Maximum marks. 100
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Note Attempt any Five questions. All questions carry equal marks.
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Question No.
01 (A) What is the Wave Function? Give its significance. Distinguish between the Eigen-function and Eigen-value with examples.
(B) Derive the Schrödinger’s Wave Equation for a particle in One-dimensional box .
02 (A) Derive a relationship between the Gibbs free energy and Equilibrium constant.
(B) Write a note on Third Law of Thermodynamics and also discuss the significance of absolute entropy.
03 (A) Derive the Integrated rate equation for the 2nd order reaction with the same initial concentration.
(B) Derive Arrhenius Equation and discuss its significance.
04 (A) Discuss the Mechanism of Nucleophilic substitution reactions of Alkyl Halides with reference to SN1 and SN2 reaction. How do these two Mechanisms differ?
(B) What is meant by Racemization? Discuss two methods for the resolution of Racemic Mixture.
05 (A) Explain why?
(i) Ammonia is more basic than Aniline.
(ii) Chloroacetic Acid is stronger acid than Acetic Acid.
(B) Describe completely the “Rules of Resonance”
06 (A) What is Grignard Reagent? Draw Monomer and Dimer structures of Grignard Reagent.
(B) Write short notes on the following: (i) Inductive Effect (ii) Hyper conjugation (iii) Explain the structure and reactivity of Carbonyl Group.
07 (A) Describe the following characteristics of the first series of the transition metals and their trends in the series (Sc to Zn):
(i) Atomic Radii (ii) Oxidation States. (iii) Ionization Enthalpies
(B) Describe important Alloys of the Lanthanoid Metals.
08 (A) How we can classify Chromatography according to Mechanism involved? Briefly describe affinity Chromatography and Electrophoresis?
(B) Compare applicability of t and F test to Chemical Analysis?
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