Federal Public Service Commission (FPSC)
Competitive Examination for Recruitment to BPS-17 Posts under the Federal Government
Time Allowed: 3 Hours
MAXIMUM MARKS: 100 Marks
CHEMISTRY, PAPER-I
PART-II
Attempt FIVE questions in all, Including Questions No.1 which is COMPULSORY, All questions carry EQUAL marks.
Q. No. 2. (a) What is Pauli’s Exclusion Principle? (05)
(b) Give the electronic configuration of Sodium. (05)
(c) What are Bohr’s postulates and how do they explain the hydrogen atom spectrum? (10)
Q. No. 3. (a) Define Heat of combustion. How is it experimentally determined? (10)
(b) For the combustion of 1 mole of benzene at 25 °C, the heat of reaction at constant pressure is given by:
C₆H₆(l) + 15/2 O₂(g) → 6CO₂(g) + 3H₂O(l); ΔH° = -326720.32 J
Calculate ΔE at 25 °C. (10)
Q. No. 4. (a) Describe the manufacture of Phosphorus on a large scale. (05)
(b) Draw the figure of Nitrogen cycle in nature. (05)
(c) Compare the physical properties of three allotropic forms of Carbon. (10)
Q. No. 5. (a) How is steel manufactured? Describe various chemical reactions taking place in the blast furnace. (10)
(b) Describe the electrolytic refining of Copper. (10)
Q. No. 6. (a) What are fertilizers? Why are they needed? Describe various types of fertilizers and their uses. (10)
(b) Describe the processes of Urea manufacturing in Pakistan. (10)
Q. No. 7. (a) What are transition metals? Discuss their characteristic features. (05)
(b) Draw molecular orbital diagrams of [Co(NH₃)₆]³⁺ and [CoF₆]³⁻. (10)
(c) What was Rutherford’s atomic model? (05)
Q. No. 8. (a) What is the Greenhouse Effect? How does it cause global warming of Earth? (10)
(b) What is meant by water pollution? Discuss various sources of water pollution. (10)
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