PUNJAB PUBLIC SERVICE COMMISSION
Combined Competitive Examination (CCE) 2020
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) Define concentration, activity, and activity coefficient. (3 Marks)
b) Discuss the importance of Gibbs free energy in chemistry. (7 Marks)
c) What is radioactivity and how is it measured? (10 Marks)
Q. No. 2
a) Define the first law of thermodynamics and derive its mathematical expression. (10 Marks)
b) What is a nuclear reaction? Differentiate between fission and fusion reactions. (10 Marks)
Q. No. 3
a) Define equivalent conductance and molar conductance. How are they measured? (10 Marks)
b) Differentiate between: (4 Marks)
i. Potential and potential difference
ii. Normal hydrogen electrode and glass electrode
c) What is pH and how is it measured? (6 Marks)
Q. No. 4
a) Explain the relationship between free energy and equilibrium constant. (5 Marks)
b) How is diammonium phosphate fertilizer prepared? (5 Marks)
c) How is caustic soda prepared and obtained in solid form? (10 Marks)
Q. No. 5
a) What are chelates? Draw structures of three chelates. (5 Marks)
b) What is the difference between VBT and CFT? (5 Marks)
c) Define transition elements, locate them in the periodic table, and discuss their ionic configurations. (10 Marks)
Q. No. 6
a) Define hybrid orbital, bond order, and metallic bond. (3 Marks)
b) What is Molecular Orbital Theory? (3 Marks)
c) Differentiate between ionic and covalent bonds. (4 Marks)
d) Draw the molecular orbital diagram of O₂ molecule and discuss its paramagnetic nature. Also explain the non-existence of helium molecule on the basis of Molecular Orbital Theory. (10 Marks)
Q. No. 7
a) Define eigenfunction and eigenvalue. (2 Marks)
b) Derive Schrödinger wave equation and discuss its physical significance. (10 Marks)
c) Explain the tunneling effect. (8 Marks)
Q. No. 8
a) Explain briefly the advantages and disadvantages of supplying sewage and sludge to agricultural soil. (10 Marks)
b) State and explain the Debye–Hückel theory. How can it be applied to strong electrolytes? (10 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
a) Illustrate the difference between the following with examples: (9 Marks)
i. Tautomerism and Steric Effect
ii. Centre of symmetry and Axis of symmetry
b) Why ClCH₂COOH and HCOOH are stronger acids than CH₃COOH? (5 Marks)
c) Explain how resonance effect makes: (6 Marks)
i. Phenol an ortho/para nucleophilic center
ii. Nitrobenzene an electrophilic center
Q. No. 2
a) How will you synthesize aldehydes starting from: (9 Marks)
i. Acid chloride
ii. Phenol
iii. Toluene
b) Discuss the mechanism of the following reactions: (7 Marks)
i. Aldol condensation
ii. Reimer–Tiemann reaction
c) Why do Tollens’ reagent and Fehling’s solution oxidize aldehydes but not ketones? (4 Marks)
Q. No. 3
a) Describe the main components and their roles in a simple double beam IR spectrophotometer. (9 Marks)
b) Explain the principle of Raman spectroscopy. How is it more advantageous than IR spectroscopy? (6 Marks)
c) Write a brief note on applications of UV/Visible spectroscopy. (5 Marks)
Q. No. 4
a) Starting from benzene, how will you prepare the following: (15 Marks)
i. Benzoic acid
ii. 2,5-cyclohexadiene-1-carboxylic acid
iii. tert-Butyl benzene
iv. Benzotrichloride
b) Discuss orientation in substituted naphthalene. (5 Marks)
Q. No. 5
a) Explain any four methods for resolution of a racemic mixture. (8 Marks)
b) Define the following: (12 Marks)
i. Steroids
ii. PCR
iii. Epimerization
iv. Oligosaccharides
v. Composites
vi. Vulcanization
Q. No. 6
a) What are vitamins? How are they classified? Discuss their role in the human body. (9 Marks)
b) State applications of column chromatography. (3 Marks)
c) Differentiate between dyes and pigments. (3 Marks)
d) Why are dyes colored compounds? (5 Marks)
Q. No. 7
a) Classify pigments and describe the characteristics of a good pigment. (6 Marks)
b) Write the names and structures of monomers used to prepare the following polymers: (5 Marks)
i. Teflon
ii. Orlon
iii. Nylon-6
iv. Dacron
v. Neoprene
c) Elaborate the following: (9 Marks)
i. Development of chromatogram
ii. Types of addition polymerization
iii. Effect of doping in semiconductors
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