Chemistry CSS Paper I 2020

FEDERAL PUBLIC SERVICE COMMISSION
COMPETITIVE EXAMINATION – 2020
FOR RECRUITMENT TO POST IN BS – 17
UNDER THE FEDERAL GOVERNMENT

CHEMISTRY

TIME ALLOWED: THREE HOURS
PART – I (MCQs): MAXIMUM 30 MINUTES
PART – I (MCQs): MAXIMUM MARKS = 20
PART – II MAXIMUM MARKS = 80

NOTE:
(i) Part – II is to be attempted on the separate Answer Book.
(ii) Attempt ONLY FOUR questions from PART – II. ALL questions carry EQUAL marks.
(iii) All the parts (if any) of each Question must be attempted at one place instead of at different places.
(iv) Candidate must write Q. No. in the Answer Book in Accordance with Q. No. in the Q. Paper.
(v) 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 attempted question will not be considered.

PART-II

Q. No. 2. (a) Write two equations of state for real gases and compare them high lighting their important features. (10)
(b) (I) Explain Heisenberg’s uncertainty principle. (05)
(II) Discuss Born’s interpretation of wave function (05) (10) (20)

Q. No. 3. (a) Explain the Kohlrausch law. Why do the real solution should deviate from the Iaw? (10)
(b) Compare Langmuir’s and Freundlich’s adsorption isotherms (10) (20)

Q. No. 4. (a) Explain the Arrhenius equation. Also highlight its applications and limitations. (10)
(b). Explain various acid-base theories. What are hard and soft acids and bases? (10) (20)

Q. No. 5. (a) Make a comparison of column chromatography and thin layer chromatography (TLC) by highlighting merits and dements of the both. (10)
(b) Explain Werner’s theory of coordination complexes. Give examples from d-block transition metals. (10) (20)

Q. No. 6. (a) Give a comprehensive classification of various chromatographic techniques. Also mention potential application of each. (10)
(b) (i) What is Hydrogen bonding. Explain. (05)
(ii) Describe Hybridization in p-block elements. (5) (10) (20)

Q. No. 7. (a) Explain crystal Field Theory (CFT) for d-block elements. (10)
(b) Write an extensive essay on types of chemical bonding giving examples. (10) (20)

Q. No. 8. Write short notes on the following: (5 each) (20)
(i) Liquid junction potential
(ii) Potentionmetry
(iii) Collision theory of Chemical reactions.
(iv) Transition state theory.

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