PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE, ETC -2025
CASE NO. 36C2025
SUBJECT: CHEMISTRY (PAPER-I)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:
i. All the parts (if any) of each Question must be attempted at one place instead of at different places.
ii. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
iii. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
iv. Extra attempt of any question or any part of the question will not be considered.
NOTE: Attempt Any FIVE Questions. All Questions Carry Equal Marks. Attempt in English or Urdu.
Q No. 1: a) Derive Schrodinger wave equation by considering a particle moving in an angular path.
b) Explain Magnetic quantum numbers (m). (12+8=20 Marks)
Q No. 2: a) Write a brief note on standard free energy.
b) Derive the expression showing relationship between free energy change and equilibrium constant.
c) Explain the concept of residual entropy with the help of suitable examples.
(4+10+6=20 Marks)
Q No. 3: a) Define standard electrode potential. Explain the standard hydrogen electrode.
b) What is relaxation effect of ions in Debye-Huckle theory? (12+8=20 Marks)
Q No. 4: a) Explain the kinetics of Radioactive Decay. Also deduce the equation showing relationship between half life period (t₀.₅) and decay constant (λ).
b) Discuss the uses of radioactive isotopes in:
(i) Medical treatment (ii) Industry (iii) Research (10+10=20 Marks)
Q No. 5: a) What are the main points of VSEPR theory and explain the structure of AX₃ type arrangement?
b) Explain the structure of PF₅ as sp³d hybridization.
(12+8=20 Marks)
Q No. 6: a) Distinguish between the term ligand, donor atom and chelate.
b) Which of the following complexes obey EAN rule?
i) Na₄[Cu(CN)₆] ii) K₄[Ni(CN)₄] iii) [Cr(NH₃)₆]Cl₃ iv) [Fe(CO)₅]
c) Why transition elements are coloured in nature and how magnetic moment of coordination complexes can be calculated?
(6+8+6=20 Marks)
Q No. 7: a) Describe the following steps:
(i) Preparation and purification of brine (ii) Carbonation of ammoniated brine, in Solvay’s process of soda ash.
b) Write the chemical reactions involved in Solvay’s process of soda ash.
(12+8=20 Marks)
Q No. 8: Write notes on the following: (5+10+5=20 Marks)
(i) Stratification of the atmosphere
(ii) Ozone depletion
(iii) Gaseous Inorganic Air Pollutants
COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE, ETC -2025
CASE NO. 36C2025
SUBJECT: CHEMISTRY (PAPER-I)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:
i. All the parts (if any) of each Question must be attempted at one place instead of at different places.
ii. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
iii. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
iv. Extra attempt of any question or any part of the question will not be considered.
NOTE: Attempt Any FIVE Questions. All Questions Carry Equal Marks. Attempt in English or Urdu.
Q No. 1: a) Derive Schrodinger wave equation by considering a particle moving in an angular path.
b) Explain Magnetic quantum numbers (m). (12+8=20 Marks)
Q No. 2: a) Write a brief note on standard free energy.
b) Derive the expression showing relationship between free energy change and equilibrium constant.
c) Explain the concept of residual entropy with the help of suitable examples.
(4+10+6=20 Marks)
Q No. 3: a) Define standard electrode potential. Explain the standard hydrogen electrode.
b) What is relaxation effect of ions in Debye-Huckle theory? (12+8=20 Marks)
Q No. 4: a) Explain the kinetics of Radioactive Decay. Also deduce the equation showing relationship between half life period (t₀.₅) and decay constant (λ).
b) Discuss the uses of radioactive isotopes in:
(i) Medical treatment (ii) Industry (iii) Research (10+10=20 Marks)
Q No. 5: a) What are the main points of VSEPR theory and explain the structure of AX₃ type arrangement?
b) Explain the structure of PF₅ as sp³d hybridization.
(12+8=20 Marks)
Q No. 6: a) Distinguish between the term ligand, donor atom and chelate.
b) Which of the following complexes obey EAN rule?
i) Na₄[Cu(CN)₆] ii) K₄[Ni(CN)₄] iii) [Cr(NH₃)₆]Cl₃ iv) [Fe(CO)₅]
c) Why transition elements are coloured in nature and how magnetic moment of coordination complexes can be calculated?
(6+8+6=20 Marks)
Q No. 7: a) Describe the following steps:
(i) Preparation and purification of brine (ii) Carbonation of ammoniated brine, in Solvay’s process of soda ash.
b) Write the chemical reactions involved in Solvay’s process of soda ash.
(12+8=20 Marks)
Q No. 8: Write notes on the following: (5+10+5=20 Marks)
(i) Stratification of the atmosphere
(ii) Ozone depletion
(iii) Gaseous Inorganic Air Pollutants
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