Solved question paper for CHEMISTRY May-2018 (B-TECH electronics and communication engineering 1st-2nd)

Question paper 1

1. Section A

   1. (a) How cathodic protection of iron different from its galvanization?

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2. b) What is photochemistry?

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3. c) Carbon dioxide can undergo stretching as well as bending vibrations whereas HCI can
   undergo stretching only Explain.

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4. d) What is % atom economy?

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6. e) What is standard hard Water?

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7. f) What do you understand by functionality of a molecule?

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8. g) Explain nanocrystals.

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9. h) What are petrochemicals?

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11. i) Give two examples of monomers that will give stereoregular polymers.

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12. j) What is degree of polymerization?

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13. Section B

    2. Write short notes on:
    a) Shielding and deshielding of protons
    b) Factors affecting vibrational frequency

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14. 3. a) Explain the fluorescence phosphorescence with the help of Jablonski diagram.
    Explain any other information derived from this diagram.
    b) Define Stark-Einstein law of photochemical equivalence.
    c) Define Grothus-Draper Law
     

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16. 4. a) Discuss scale and sludge formation in boilers Describe methods used for their
    prevention.
    b) What are advantages of break-point chlorination?

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17. 5. a) Explain the principle that Chemical products should be so designed that at the end of
    their function they do not persist in the environment and break down into innocuous
    degradation products.
    b) Explain concept of alternate solvents in Green chemistry.

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18. Section C

    6. a) Discuss use of inhibitors for corrosion control.
    b) Describe differential aeration corrosion.

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19. 7. a) What do you understand by tacticity? Explain with the help of suitable examples.
    b) What is polymerization? Discuss the types of polymerization?

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21. 8. a) Explain the concept of two dimensional assemblies.
    b) What are coercing colloids? Explain.

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22. 9. a) Discuss the characteristics of good fuel.
    b) What is natural gas? Give its origin, properties and treatment processes.

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Question paper 2

1. Section A

   1. a) Define over-voltage. Discuss its significances or limitations
    

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2. b) What are the differences between stable and metastable equilibrium?

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3. c) Define chemical actinometer with example & different types.

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4. d) Despite of the involvement of radiations & matter in both, what are the differences
   between spectroscopy and photochemistry?

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6. e) Discuss spin-lattice relaxations. What is their significance?

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7. f) What is metastable state?

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8. g) Give the number of components, number of phases & number of degrees of freedom in
   Ammonium chloride vapour, partly dissociated into ammonia and HCl.

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9. h) What are masers? How do they differ or relate to lasers?

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11. i) What is the cell reaction occurring in Weston standard cell?

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12. j) Define chemical shift and double resonance.

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13. SECTION B

    2. Discuss in details various parameters determining quality of water. What should be the range of those parameters for water to be used for drinking and washing purposes?

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14. 3. Discuss in details the wet corrosion. Discuss various preventive measures for various types of corrosions.

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16. 4. Write a detailed note on chromatographic development and applications of chromatography.

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17. 5. Derive Nernst equation. Calculate the mean ionic activity co-efficients of 0.1 moL/Kg HCI, given the emf of the cell
                                     H2 (latm)/ HCI (a), AgCI (s)/Ag
    is 0.3524V and that standard electrode potential of Ag-AgCl is 0.2224V @25°C.

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18. SECTION C

    6. Describe in brief the Jablonskii’s diagram and discuss various theories for mechanism of photosynthesis.
     

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19. 7. What are fundamental bands? Discuss Franck-Condon principle on details.

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21. 8. Give the number of lines in ESR spectrum of anthracene radical anion. Discuss MRI in
    details.

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22. 9. Lead (m.p. 327oC) and Silver (m.p. 961°C) form eutectic mixture at 303°C with 2.6% by
    weight of silver. Discuss the desilverization of lead on the basis of the phase diagram.

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