PUNJAB PUBLIC SERVICE COMMISSION Combined Competitive Examination (CCE) 2025 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) Derive Schrödinger wave equation by considering a particle moving on an angular path.
b) Explain Magnetic quantum numbers ($m$). (15+5=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. Describe the standard hydrogen electrode.
b) What is relaxation effect of ions in Debye-Hückel theory? (12+8=20 Marks)
Q.No.4
a) Explain the kinetics of Radioactive Decay and deduce the equation showing relationship between half life period ($t_{1/2}$) and decay constant ($\lambda$).
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 $AB_5$ type arrangement?
b) Explain the structure of $PCl_5$ using hybridization. (12+8=20 Marks)
Q.No.6
a) Distinguish between the terms Ligand, donor atom and chelate.
b) Which of the following complexes obey EAN rule? (i) $[Fe(CN)_6]^{4-}$ (ii) $[Ni(CN)_4]^{2-}$ (iii) $[Cr(NH_3)_6]Cl_3$ (iv) $[Fe(CO)_5]$.
c) Why transition elements are coloured in nature and how magnetic moment of coordination complexes can be calculated? (6+6+8=20 Marks)
Q.No.7
a) Describe the following steps: (i) Preparation and purification of brine (ii) Carbonation of ammoniated brine (iii) Solvay’s process of soda ash.
b) Write the chemical reactions involved in Solvay’s process of soda ash. (12+8=20 Marks)
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) Explain Hydrogen bonding. Describe its types and applications in modern science.
b) Give three examples of keto-enol tautomerism of different compounds. (10+10=20 Marks)
Q.No.2
a) Discuss the orientation spectra of benzene. What is the effect of: (1) Deactivators and (2) Auxochromic group attached to benzene?
b) How will you distinguish between the following by IR Spectroscopy? (1) Acetic acid and ethyl acetate (2) Benzene and benzaldehyde. (10+10=20 Marks)
Q.No.3
a) How aldehydes and ketones are prepared by: (1) Oxidation of 2-alcohol (2) Dehydrogenation of 1-alcohol (3) Rosenmund reduction (4) Stephen’s reduction.
b) Write notes on: (1) Wolff-Kishner reduction (2) Clemmensen reduction (3) Cannizzaro reaction. (10+10=20 Marks)
Q.No.4
a) What is aromaticity? Discuss Hückel’s rule for aromaticity. Give examples.
b) How will you prepare following compounds from Toluene? (1) Benzoic acid (2) Benzyl chloride (3) m-nitrobenzoic acid. (10+10=20 Marks)
Q.No.5
a) Discuss properties of Enantiomers and Diastereomers. What is optical isomerism? Discuss conditions for optical isomerism. Give various optical isomers of tartaric acid.
b) Write notes on: (1) Resolution of racemic mixtures (2) Walden inversion. (10+10=20 Marks)
Q.No.6
a) Describe the structure of two monosaccharides, one disaccharide and polysaccharide starch and cellulose.
b) Define the following terms with suitable examples: (1) Mutarotation (2) Glucosazone (3) Hemiacetal (4) Epimer (5) Glycosidic linkage (6) Reducing sugar (7) Non-reducing sugar (8) Invert sugar (9) Aldonic acid. (10+10=20 Marks)
Q.No.7
What is Column chromatography? Discuss the structure and working of HPLC. Also discuss its importance in industry. (20 Marks)
