FEDERAL PUBLIC SERVICE COMMISSION

COMPETITIVE EXAMINATION-2017 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) Derive Schrodinger wave equation for motion of a particle in one dimensional box. (10)
• (b) Solve Schrodinger wave equation to find the expression for wave function energy of a particle in one dimensional box. (6)
• (c) What is Eigen function and Eigen value? Give examples. (4)

Q. No.3.

• (a) Define heat capacities and molar heat capacities. Prove that C,-C\=R for ideal gases. (10)
• (b) What is Gibbs energy? Derive a relation between standard Gibbs energy change and equilibrium constant. (6)
• (c) Differentiate spontaneous and non spontaneous process. (4)

Q. No.4.

• (a) State and explain Kohlrausch’s law. Give its applications. (10)
• (b) What is meant by standard deviation? Give its significance in analytical chemistry. (6)
• (c) Briefly describe conductometric titrations. (4)

Q.No.5.

• (a) Discuss the effect of temperature on rate of chemical reaction on the basis of Arrhenius equation. How can you determine activation energy and pre-exponential factor for a chemical reaction using Arrhenius equation? (10)
• (b) Derive kinetic equation for 1* order reaction. (6)
• (c) Prove that half life period for 1“ order reaction is independent of initial concentration of reactant. (4)

Q. No.6.

• (a) What is adsorption isotherm? Derive Langmuir adsorption isotherm for adsorption of a gas on solid surface. (10)
• (b) What is enzyme catalysis? Discuss its kinetics. (6)
• (c) What are surfactants? Give their properties. (4)

Q.No.7.

• (a) What is electrophoresis? Give its principle and discuss its applications in biochemistry. (10)
• (b) Give six chemical properties of nitrogen. (6)
• (c) What is Common ions effect? Give its applications. (4)

Q. No.8.

• (a) State John-Teller theorem. Explain it using suitable examples from coordination _— complexes. (10)
• (b) Give postulates of Werner’s theory of coordination complexes. (6)
• (c) Briefly describe nuclear decay rate law for disintegration of radioactive elements. (4)

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