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 can it be explained electrochemically? Also, list methods to avoid them. (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:
i. Millimole
ii. Equivalent
iii. Tunneling effect
iv. Potential
v. Entropy
(5 x 2 = 10 Marks)
b) Derive the equation of wave function for a particle moving in one dimension. (10 Marks)
Q No. 3:
a) Differentiate between K[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 on why ClO₃ and H₂SO₃ have the same geometry. (7+3 = 10 Marks)
Q No. 4:
a) Define pollutant. How does it produce adverse effects on living organisms and cause imbalance in the environment? (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 “Hu = Eu” by the Schrödinger wave equation? (10 Marks)
b) Briefly, explain the following:
i. Principal Quantum Number
ii. Azimuthal Quantum Number
(5+5 = 10 Marks)
Q No. 6:
a) Define thermodynamics and enthalpy. Prove the First Law of Thermodynamics by mathematical formulation. (10 Marks)
b) Explain the following:
i. Gibbs free energy and its applications in different processes
ii. Change in enthalpy (ΔH) and its relationship with change in energy (ΔE)
(5+5 = 10 Marks)
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