PUNJAB PUBLIC SERVICE COMMISSION
Combined Competitive Examination (CCE) 2024
For Recruitment to the Posts of Provincial Management Service (PMS)
SUBJECT: Chemistry (Paper-I)
Time Allowed: 3 Hours
Maximum Marks: 100
Note: Attempt any five questions in all. Attempt in Urdu or English.
Q. No. 1
a) What is meant by corrosion? How can it be explained electrochemically? Also list methods to prevent it. (10 Marks)
b) Define Gibbs free energy. How can it be related to the equilibrium constant? Derive the relationship. (10 Marks)
Q. No. 2
a) Define the following: (5 × 2 = 10 Marks)
i. Millimole
ii. Equivalent
iii. Tunneling effect
iv. Potential
v. Entropy
b) Derive the equation of wave function for a particle moving in one dimension. (10 Marks)
Q. No. 3
a) Differentiate between [Fe(CN)₆]⁴⁻ and [Fe(H₂O)₆]²⁺ on the basis of Crystal Field Theory (CFT). Also explain the distortion present in copper complexes. (4 + 6 = 10 Marks)
b) Write down the postulates of Valence Bond Theory (VBT) in case of transition metal compounds. Also comment why ClO₄⁻ and H₂SO₄ have similar geometry. (7 + 3 = 10 Marks)
Q. No. 4
a) Define pollutant. How does it produce adverse effects on living organisms and cause environmental imbalance? (10 Marks)
b) Explain briefly the advantages and disadvantages of supplying sewage and sludge to agricultural soil. (10 Marks)
Q. No. 5
a) How will you prove Hψ=EψH\psi = E\psiHψ=Eψ using the Schrödinger wave equation? (10 Marks)
b) Briefly explain the following: (5 + 5 = 10 Marks)
i. Principal Quantum Number
ii. Azimuthal Quantum Number
Q. No. 6
a) Define thermodynamics and enthalpy. Prove the first law of thermodynamics using mathematical formulation. (10 Marks)
b) Explain the following: (5 + 5 = 10 Marks)
i. Gibbs free energy and its applications in different processes
ii. Change in enthalpy (ΔH) and its relationship with change in energy (ΔE)
Q. No. 7
a) Define hybridization and give examples. Write down the rules of hybridization and explain sp and sp³ hybridization. (10 Marks)
b) Describe the main postulates of Molecular Orbital Theory. Give its application in heteronuclear diatomic molecules with two examples. (10 Marks)
Q. No. 8
a) Discuss the nature of alpha (α) rays and gamma (γ) rays. Describe the kinetic study of radioactive decay with an example. (10 Marks)
b) Define pollution, pollutants, and contaminants. Describe the sources, effects, and control of carbon monoxide as a pollutant. (10 Marks)
SUBJECT: Chemistry (Paper-II)
Time Allowed: 3 Hours
Maximum Marks: 100
Note: Attempt any five questions in all. Attempt in Urdu or English.
Q. No. 1
i) Draw the structures of the following compounds: (5 Marks)
a) Spiro[2.4]heptane
b) Bicyclo[2.2.2]octane
c) Hexanedioic acid
d) 4-oxobutanoic acid
e) Ethanoic anhydride
ii) Justify the following statements: (2 × 5 = 10 Marks)
a) Dimethylamine is a stronger base than methylamine, which is stronger than ammonia
b) Phenol is more acidic than ethanol
c) m-chlorobenzoic acid is stronger than p-chlorobenzoic acid
d) Pyrrole is a weaker base than pyridine
iii) Draw the resonance structures of the following compounds: (5 Marks)
a) CH₂=CH–CH₃
b) CH₃–CH–O–CH₃
c) CH₃–N=N=N
d) CH₂=CH–C≡N
e) CH₃–CO–CH₂–COOC₂H₅
Q. No. 2
i) Methanol is a good solvent for UV spectroscopy but not for IR spectroscopy. Explain. (5 Marks)
ii) Briefly describe the difference between Beer’s law and Lambert’s law. (5 Marks)
iii) Explain the working of a double beam IR instrument with discussion on sample preparation and absorbance recording. (10 Marks)
Q. No. 3
a) Illustrate the differences between the following with examples: (17 Marks)
i. Conjugation and Hyperconjugation
ii. Mesomeric effect and Inductive effect
iii. Chromophore and Auxochrome
iv. Electromeric effect and Resonance effect
b) Why do esters have lower boiling points than their corresponding acids? (3 Marks)
Q. No. 4
a) Explain the principle of UV and IR spectroscopy. (7 Marks)
b) How would you distinguish between ethane, ethylene, and acetylene by IR spectroscopy? (6 Marks)
c) Differentiate between bathochromic shift and hypsochromic shift. What is the formula for absorbance in UV spectroscopy? (7 Marks)
Q. No. 5
i) Explain the steps involved in the phenomenon of Walden inversion. (5 Marks)
ii) Discuss the role of Nicol prism in plane-polarized light. (5 Marks)
iii) Sketch the energy profile diagram and shapes of boat, twist-boat, half-chair, and chair conformations of cyclohexane. (10 Marks)
Q. No. 6
i) Differentiate between the following with examples: (2 × 4 = 8 Marks)
a) Fats and oils
b) Soap and detergents
c) Lipids and waxes
d) Isoelectric point and flash point
ii) Proteins exhibit a variety of colored reactions. Describe any four. (8 Marks)
iii) Hydrogen bonding plays an important role in protein structure. Explain. (4 Marks)
Q. No. 7
a) What are carbohydrates? Discuss their classification. (2 + 6 = 8 Marks)
b) Differentiate between paper partition chromatography and adsorption paper chromatography. (6 Marks)
c) Define detergent. What are its types and how is it different from soap? (2 + 2 + 2 = 6 Marks)
Q. No. 8
a) Explain the difference between chain growth and step growth polymerization. (6 Marks)
b) Write short notes on the following: (3.5 × 4 = 14 Marks)
i. Thin Layer Chromatography (TLC)
ii. Functions of lipids
iii. PTFE and its applications
iv. P-type and N-type semiconductors
