FEDERAL PUBLIC SERVICE COMMISSION

COMPETITIVE EXAMINATION-2020 FOR RECRUITMENT TO POSTS IN BS-17
UNDER THE FEDERAL GOVERNMENT

CHEMISTRY, Paper-1

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.
• (vi) 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) (0)

Q. No. 3.

• (a) Explain the Kohlrausch law. Why do the real solution should deviate from the law? (10)
• (b) Compare Langmuir’s and Freundlich’s adsorption isotherms. (10) = (20)

Q. No. 4.

• (a) Explain the Arrhenius equation. Also high light 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 demerits of the both. (10)
• (b) Explain Werner’s theory of coordination complexes. Give examples from  d-block transition metals. (10)

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 Hybidization in p-block elements. (05) (10) (0)

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: (Seach) (20)

• (i)Liquid junction potential
• (ii) Potentiometry
• (iii) Collision theory of Chemical reactions.
• (iv) Transition state theory.

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