SINDH PUBLIC SERVICE COMMISSION, HYDERABAD.
Combined Competitive Examination, 2021
CHEMISTRY
Thursday the 17th February, 2022.
Time: 02:00 pm to 05: 00 pm Maximum marks. 100
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Note Attempt any Five questions.
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Question No. Marks
01 (A) Write a detailed note on fuel cell, its, types and working of a fuel cell. 10
(B) Explain electrochemical series and describe its role in the construction of cell. 10
02 (A) What are the different concept of Acids and bases? Discuss with suitable examples. 10
(B) What is common Ion effect? Give its applications. 05
(C) What are Redox Indicators and adsorption Indicators? Explain. 05
03 (A) Define first order reaction. Derive the Kinetic expression for the first order reaction. 12
(B) What is Pseudo-Unimolecular reaction? Discuss it with suitable examples. 08
04 (A) Explain the term Quantum number. Give a brief account of the four quantum numbers. 12
(B) Discuss Valence Bond Theory of bonding in H2 molecule. Point out his main limitations. 08
05 (A) Derive Schrödinger wave equation for the wave mechanical model of an atom. 08
(B) What is Einstein Theory of Photoelectric effect? What conclusion can be drawn from this theory? 06
(C) Derive de-Broglie’s equation for the dual nature of matter. Apply this equation for microscopic and macroscopic properties of substances. 06
06 (A) What are necessary conditions for the absorption of IR region, and why? 08
(B) What is difference between: 12
(i) Chromophore and auxochrome
(ii) Pyrolysis and cracking
(iii) Optical rotation and specific rotation. (iv) Anti staggered and gauche-staggered.
07 (A) Discuss the Raw material used for the production of Glass Industry. 10
(B) Discuss the manufacturing of soap by continuous process with the help of flow sheet diagram. 10
08 (A) Write down the reaction and mechanism of Friedel-Craft alkylation and acylation of benzene. 10
(B) Define Aromaticity. What is Huckle rule? Explain with examples? 10
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