CSS Chemistry Past Paper 2021

Instructions specific to this paper

• Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
• Use of calculator is allowed.
• Give Molecular interpretation of entropy. (05) (10) (20)
• Explain factors affecting the rate of a chemical reactions. (05)
• Explain Eigen function & Eigen value. (05) (10) (20)

Questions

1. Q. 25 marks

   (a) Explain applications of Schrodinger wave equation to hydrogen and hydrogen (10) like Atom. (b) (i) Give Molecular interpretation of entropy. (10) (20) (ii) Explain factors affecting the rate of a chemical reactions. (05)

2. Q. 320 marks

   (a) What are the uses of chelates. (07) (b) State and explain Nomenclature of coordination complexes. (07) (c) Explain VBT (Valence Bond Theory) of coordination complexes in detail. (06)

3. Q. 45 marks

   (a) Explain photoelectric effect and probability density. (10) (b) (i) Explain Eigen function & Eigen value. (10) (20) (ii) Derive Schrödinger wave equation for a particle in one dimensional box. (05)

4. Q. 55 marks

   (a) Predict molecular shapes using Valence Shell Electron Pair Repulsion (VESPER) (10) model. (b) (i) Explain the experimental techniques for determination of order of reaction. (10) (20) (ii) Write a note on thermochemistry and calorimetry. (05)

5. Q. 620 marks

   (a) Derive a relation for dependence of Gibbs free energy on temperature or Gibbs (07) Helmholtz equation. (b) What is isothermal process? Explain work done in isothermal reversible expansion of (07) an ideal gas. (c) Explain fugacity and activity. (06)

6. Q. 720 marks

   (a) Discuss common ion effect and its industrial applications in detail. (08) (b) Describe significance of pka, pkb, pH. (06) (c) Write a note on basic concepts of chemical equilibrium. (06)

7. Q. 820 marks

   Write notes on the following:- (i) Debye-Huckel theory. (07) (ii) Nernst’s equation. (07) (iii) Electrochemical series. (06)

Standard FPSC instructions

Printed on this and every CSS paper.

• Part-II is to be attempted on the separate Answer Book.
• All the parts (if any) of each question must be attempted at one place instead of at different places.
• Write Q. No. in the Answer Book in accordance with Q. No. in the question paper.
• No page/space be left blank between the answers. All the blank pages of the Answer Book must be crossed.
• Extra attempt of any question or any part of the attempted question will not be considered.