BALOCHISTAN PUBLIC SERVICE COMMISSION
Samungli Road, Quetta Cantt.
COMPETITIVE EXAMINATION FOR THE POST(S) OF BCS (EB) OFFICER B-17
CHEMISTRY
Marks: 150
Wednesday, March 14, 2007 (02:30 PM)
Time: 03 Hours
NOTE: Attempt any Five Questions in all, selecting at least One Question from each section. All Questions carry equal marks.
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SECTION – I (INORGANIC)
Q-1.
(a) How will you explain the chemical reactivity of Halogens?
(b) Explain the followings:
(i) Iodine is more soluble in a solution of KI than in pure water.
(ii) Why H F is a relatively weak acid in water solution whereas the other halogen acids are strong acids.
Q-2.
(a) How sulphuric acid is prepared by Contact Process.
(b) Classify the following Oxides:
(i) SO3 (ii) ZnO (iii) MgO (iv) CO (v) H2O
Q-3.
(a) What is alum? Name two important alums with their formulae.
(b) What is Thermite Process? Give its uses.
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SECTION – II (PHYSICAL)
Q-4.
(a) Differentiate between:
(i) Homogeneous catalysis and Heterogeneous catalysis.
(ii) Enthalpy and Energy of activation.
(b) What is equilibrium constant and rate constant?
Q-5.
(a) Define Hess’s law of constant heat summation. Explain it with examples and give its applications.
(b) State the law of Thermo chemistry and show how they are based on first law of thermodynamics?
Q-6.
(a) Explain artificial radioactivity. How it helps in discovery of nucleus?
(b) Explain the Half-life and radioactive isotopes.
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SECTION – III (ORGANIC)
Q-7.
(a) How would you prepare primary, secondary and tertiary alcohol from Grignard’s reagent?
(b) Complete the following:
CH3MgBr + H2O $\rightarrow$
CH3-Cl + Cl2 $\rightarrow$
C2H4 + KMnO4 $\rightarrow$
C3H8 + O2 $\rightarrow$
CH3Cl + Na $\rightarrow$
Q-8.
(a) What are meta directing and ortho and para directing groups? What is their influence on the reactivity of benzene?
(b) How would you convert benzene into?
(i) Bromo benzene (ii) Nitro benzene (iii) Toluene (iv) Chloro benzene
Q-9.
(a) How aldehyde and ketone are prepared from carboxylic acid.
(b) Give the aldol condesation of acetaldehyde.
Q-10.
(a) How will you prepare ethanol? What is rectified spirit and absolute alcohol?
(b) Describe Lucas Test for primary secondary and tertiary alcohol.
Good Luck
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