BALOCHISTAN PUBLIC SERVICE COMMISSION
Samungli Road, Quetta Cantt.
COMPETITIVE EXAMINATION FOR THE POST(S) OF BCS (EB) OFFICER B-17 / SECTION OFFICER B-17
CHEMISTRY
Total Marks: 150
Saturday, February 14, 2009
Time Allowed: 03 Hours
Note: Attempt any Five questions. At least one question from each section.
All questions carry equal marks.
Section – I (Physical)
Q-1. (a) Explain the defects of Bohr’s Atomic Model.
(b) Name the regions where the following spectral series are present.
(i) Lyman series (ii) Balmer series (iii) Paschen series
(iv) Brackett series (v) Pfund series
Q-2. (a) How order of reaction can be determined by half-life method?
(b) State and explain Hess,s Law of constant heat summation.
Q-3. Define the following:
(i) Enthalpy (ii) Entropy (iii) Activation energy
(iv) Dalton’s law of partial pressures. (v) Factors affecting rates of reactions.
Section – II (Inorganic)
Q-4. (a) Discuss the geometry, properties and uses of Ozone molecule.
(b) What is alum? Name two important alums with their formulas.
Q-5. (a) Enumerate the application of Buffers.
(b) Converse the industrial uses of Limestone.
Q-6. (a) Define ligands and discuss their role in forming co-ordination compounds.
(b) Name the following:
K2 [Pt(Cl6)]
K4 [Ni (CN)4]
Ca2 [Fe (CN)6]
K3 [Fe (CN)6]
Section – III (Organic)
Q-7. (a) Explain Molecular Rearrangements and their types.
(b) Discuss Friedal Crafts acylation reaction.
Q-8. (a) Explain types of Elimination reactions.
(b) Discuss Saytzeff rule with example.
Q-9. (a) Discuss the principles of Mass spectrometry.
(b) Explain Nitrogen rule with examples.
Good Luck
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