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FEDERAL PUBLIC SERVICE COMMISSIONCOMPETITIVE EXAMINATION FOR RECRUITMENT TO POSTS
IN BPS – 17 UNDER THE FEDERAL GOVERNMENT, 2012
Chemistry Paper I
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TIME ALLOWED:
(PART-I)…………30 MINUTES…………..…..MAXIMUM MARKS:20
(PART-II)…………2 Hours & 30 Minutes……..MAXIMUM MARKS:80
NOTE:
(i) First attempt Part-I (MCQ) on separate Answer Sheet which shall be taken back after 30 Minutes.
(ii) Overwriting/cutting of the options/answers will not be given credit. Use of Calculator is allowed.
PART-I (MCQ)
(COMPULSORY)
PART – II
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) Extra attempt of any question or any part of the attempted question will not be considered.
Q No.2.
(i) Glucose is formed according to the following reaction, absorbing 2840 kJ of heat. How much energy will be given out by combustion of 1.08 of glucose? (4)
6CO2(g)+ 6H2O(l)? C6H12O6(s) + 6O2 (g)
(ii) State and explain the relationship of ionization energy of an atom with its reactivity.
(iii) Explain: Why dipole movement of BF3 is Zero?
(iv) Why dipole movement of NH3is greater than that of NF3?
(v) Why does SO2 have dipole movement while CO2 does not?
Q No.3.
(i) Differentiate between a gangue and slag. Give an example of a metallurgical step where slag, flux, and gangue are involved simultaneously.
(ii) Describe the different industrial process for preventing the metals from corrosion.
(iii) Draw diagram extraction of aluminum from soil.
(iv) Name the flux used in the extraction of Iron.
Q No.4.
(i) Given the reaction: XeF4(g) + F(g)XeF6(g) (04) Predict the change in hybridization and consequent, final shape of the molecule followed in the above reaction.
(ii) Valence shell electron pair repulsion theory can be used to predict the shapes of molecules. Using this theory explain the shapes acquired by BF3 and CH4.
(iii) Explain why HOH bond angle in H2O is slightly less than the tetrahedral angle 109.5?
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Q No.5.
(i) A galvanic cell consists of metallic Zn place immersed in 0.1 M Zn (NO3)2 solution and metallic plate of lead in 0.02 M Pb (NO3)2 solution. Given EoZn2 + Zn = -0.76 V, EoPB2 + Pb = -0.13 V Write the half cell reaction.
(ii) Write the overall reaction of the cell.
(iii) Calculate the e.m.f. of the cell.
(iv) Explain the Nernst heat theorem.
(v) Define enthalpy of formation.
Q No.6. Write one reaction each for the preparation of the following, Also write one use of each product.
(i) Bleaching Power
(ii) Caustic Soda
(iii) Quick Lime
(iv) Ammonia
(v) How is caustic soda manufactured by using Nelson's cell?
(vi) What is an ideal solution?
Q No.7.
(i) What do you understand by entropy? In what way the total entropy change is related to spontaneity of a system and to a system in equilibrium.
(ii) Entropy change from liquid water to steam at 373 K is 109J mol-1 K-1. What the enthalpy change for the transition of liquid water to steam at 373 K?
(iii) Define Gibbs free energy function. Explain its significance.
(iv) Explain following:
(a) Ion selective electrode
(b) Quantum yield
(c) Fuel Cell
(d) Langmuir isotherm
Q No.8.
(i) Why is chlorination not the most desirable method of disinfecting polluted water?
(ii) What are anthropogenic pollutants? Give two examples each of primary and secondary pollutants.
(iii) What are the effects of detergents on fresh water bodies?
(iv) Calculate the pH of 0.001 M HCl solution.
(v) How Global Warming is caused? List and explain four consequences of green house effect.
FEDERAL PUBLIC SERVICE COMMISSION
COMPETITIVE EXAMINATION FOR RECRUITMENT TO POSTS
IN BPS – 17 UNDER THE FEDERAL GOVERNMENT, 2012
Chemistry Paper II
{www.Mehnat.Pk}
TIME ALLOWED:
(PART-I)…………30 MINUTES…………..…..MAXIMUM MARKS:20
(PART-II)…………2 Hours & 30 Minutes……..MAXIMUM MARKS:80
NOTE:
(i) First attempt Part-I (MCQ) on separate Answer Sheet which shall be taken back after 30 Minutes.
(ii) Overwriting/cutting of the options/answers will not be given credit. Use of Calculator is allowed.
PART-I (MCQ)
(COMPULSORY)
Q.1. Select the best option/answer and fill in the appropriate box on the Answer Sheet. (20)
PART – II
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) Extra attempt of any question or any part of the attempted question will not be considered.
Q No.2.
a. What is the difference between Valence Bond Theory and Molecular Orbital Theory? (8)
b. Draw the Molecular orbital Diagram of CO molecule showing sigma, pi bonding, non-bonding and anti bonding molecular orbital. (8)
c. Discuss the difference between the Hybridization of SO2 and SO3. (4)
Q No.3.
a. Discuss the rate law of SN1 mechanism. (6)
b. What is the importance of half life in the determination of order of reaction? (6)
c. What is the pseudo first order reaction? What is its importance? (8)
Q. No. 4
a. Describe the difference between physical adsorption and chemiadsorplion. (8)
b. The data of Langmuir for the adsorption of Nitrogen and mica at 90 K given
....... ............. P (atm) ....... ........... ..2.8 ..... 3.4 .....4.0 .....4.9 ....6.0 .....7.3 ......9.4 .....12.8..... 17.9..... 23.5
------------------------------------------------------------------------------------------------------------------
Amt adsorbed cumm at 20K & 760MM ... 12.3 ... 13.4 ... 15.1 ...17.9 ...19.0 ...21.6 ....23.9 .....25.5 .....28.2..... 30.8
Estimate the surface area of the mica sample in the Langnuir experiment? (8)
c. Define Homogeneous catalyst & Heterogeneous catalyst. (4)
Q. No. 5
a. Discuss stereo isomerism in compounds having 2 similar asymmetric carbon atoms. (6)
b. Draw Fischer projection formulae of the following compounds. (8)
i) R & S 2 - Bromopentane
ii) R & S 3 - chloro-1-pentane.
iii) R & S 3-chloro-3-methylocatne
iv) R & S 2-pentanol
c. What do you understand by the terms Z & E isomers? Illustrate your answer with example. (6)
Q. No. 6
a. Discuss the structure of Grignard Reagent. (4)
b. How these compounds can be prepared by Grignard Reagent? (12)
i) Ethane
ii) Acetic Acid
iii) 2-Butanol
c. What is the diazotization reaction? (4)
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Q. No. 7
How would you prepare the following compounds from Benzene? Name each reaction as well. (20)
i) Acetophenone
ii) Bromobenzene
iii) Maleic anhydride
iv) Toluene
v) Benzaldehyde
Q. No. 8
a. Write main steps in the formation of following polymers: (3+3)
i) Nylon 6,6 and polyester by condensation polymerization
ii) Polyethlene by Free Radical polymerization
b. Differentiate between oil, fat & wax with examples. (9)
c. What are alkaloids? (5)
