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) How will you apply the Schrödinger wave equation to a hydrogen atom? (12 Marks)
b) Explain the principal quantum number (n). (8 Marks)
Q. No. 2
a) Define Le Chatelier’s principle. Explain the effect of temperature and change in concentration in the Haber process. (12 Marks)
b) Explain the types of chemical equilibrium with two examples of each. (8 Marks)
Q. No. 3
a) Define electrical conductance. Describe the Wheatstone bridge system used to measure conductance. (12 Marks)
b) What is molar conductance? Give classification of different electrolytes with examples. (8 Marks)
Q. No. 4
a) Define radioactivity. Describe natural and artificial radioactivity with two examples of each. (12 Marks)
b) Describe the nature and properties of alpha (α) rays. (8 Marks)
Q. No. 5
a) Predict the shapes of the following molecules and ions on the basis of Valence Shell Electron Pair Repulsion (VSEPR) Theory: (12 Marks) i. H₂Se ii. H₃O⁺ iii. COCl₂ iv. I₃⁻ v. SF₄ vi. IF₅
b) Discuss the defects of VBT, MOT, and VSEPR theories. (6 Marks)
c) Why is the structure of the water molecule not linear? (2 Marks)
Q. No. 6
a) Write IUPAC names of the following complexes: (6 Marks) i. Na₂[HgCl₄] ii. K₃[Fe(C₂O₄)₃] iii. [Ni(CO)₂(Ph₃P)₂] iv. [Co(ONO)(NH₃)₅]SO₄ v. [(NH₃)₅Cr–OH–Cr(NH₃)₅]Cl₅
b) Sketch the structures of the following complexes on the basis of VBT: (10 Marks) i. [Fe(CN)₆]³⁻ ii. [MnCl₄]²⁻ iii. [Ni(CN)₄]²⁻ iv. [Co(CO)₄]³⁺
c) Discuss the defects of VBT when applied to transition metal complexes. (4 Marks)
Q. No. 7
a) Explain in detail the Contact process for the manufacture of sulphuric acid along with a flow sheet diagram. (15 Marks)
b) Define glass and give its general formula. What is meant by annealing of glass? (5 Marks)
Q. No. 8
a) Explain photochemical smog and acid rain. (12 Marks)
b) Discuss heavy metal pollution in water, emphasizing lead, mercury, and cadmium. (8 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
Explain the rules of resonance with examples. Discuss the contribution of different canonical forms. (20 Marks)
Q. No. 2
a) Describe various types of electronic transitions and the types of absorption bands that arise as a result of electronic transitions in compounds. (12 Marks)
b) Explain the differences between the following: (8 Marks) i. Red shift and Blue shift ii. Transmittance and Absorbance iii. Chromophore and Auxochrome iv. Allowed and Forbidden transitions
Q. No. 3
a) How will you synthesize ethyl phenyl ketone from each of the following compounds? (10 Marks)
Benzene
Benzoyl chloride
Benzoic acid
Benzaldehyde
Benzonitrile
b) What do you know about condensation reactions? Describe two types of condensation reactions shown by aldehydes. (10 Marks)
Q. No. 4
a) How will you prepare the following compounds starting from benzene in two-step mechanisms? (10 Marks)
p-Chloronitrobenzene
m-Chloronitrobenzene
Ethylcyclohexane
n-Propylbenzene
m-Dinitrobenzene
b) Why do activating groups direct the incoming electrophile to ortho and para positions, while deactivating groups direct to the meta position? (10 Marks)
Q. No. 5
a) What are carbohydrates? Discuss the metabolism of carbohydrates. (10 Marks)
b) What are lipids? How can they be classified? Discuss their importance. (10 Marks)
Q. No. 6
a) What is Thin Layer Chromatography (TLC)? Explain its mechanism and discuss its applications. (14 Marks)
b) Compare gas chromatography with liquid chromatography. (6 Marks)
Q. No. 7
a) Discuss the applications of dyes. (8 Marks)
b) What are pigments? How can they be manufactured? Give examples. (12 Marks)
Q. No. 8
a) Explain conformational analysis. On what factors does conformational energy depend? (10 Marks)
b) Define optical activity. What are chiral compounds? How is chirality determined using a polarimeter? (10 Marks)
