PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION FOR
RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE-2019
SUBJECT: CHEMISTRY (PAPER – I)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE: Attempt Five Questions in All. Attempt in Urdu or English.
Q No. 1: (a) What is meant by corrosion? How it can be explained electrochemically? Also list methods to avoid them. (10 Marks)
(b) Define Gibbs free energy. How it can be related to equilibrium constant? Derive the relationship. (10 Marks)
Q No. 2: (a) Define the following: (5 x 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 K4[Fe(CN)6] and [Fe(H2O)6]SO4 on the basis of CFT. Also explain the distortion present in copper complexes. (4 + 6 = 10 Marks)
(b) Write down postulates of VBT in case of transition metal compounds. Also comment, why CIO4-1 and H2O4 has the same geometry. (7 + 3 = 10 Marks)
Q No. 4: (a) Define pollutant. How it produces adverse effect on living organisms and imbalance in the environment? (10 Marks)
(b) Explain briefly the advantage and disadvantage of supplying sewage and sludge to the agriculture soil. (10 Marks)
Q No. 5: (a) How will you prove “Hψ = Eψ” by the Schrodinger wave equation? (10 Marks)
(a) Briefly, explain the followings: (5 + 5 = 10 Marks)
(i) Principal Quantum Number (i) Azimuthal Quantum Number
Q No. 6: (a) Define thermodynamics and enthalpy. Prove First law of thermodynamics by mathematical formulation. (10 Marks)
(b) Explain the followings, (5 + 5 = 10 Marks)
(i) Gibbs free energy and its applications in different process (ii) Change in enthalpy (AH) and relationship with change in energy (ΔE)
Q No. 7: (a) Define hybridization and give examples. Write down the rules of hybridization and explain SP hybridization 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 rays (γ). Describe the kinetic study of radioactive decay. Give example. (10 Marks)
(b) Define pollution, pollutants and contaminants. Describe the source, effects and control of carbon monoxide as pollutant. (10 Marks)