Download AKTU B-Tech 2nd Sem 2015-16 AS 203 Engineering Chemistry Question Paper

Printed Pages: 4                                                                                                                             AS-203

(Following Paper ID and Roll No. to be filled in your Answer Books)

Paper ID : 199203                                                                                                                    Roll No.

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B.TECH.

Theory Examination (Semester-II) 2015-16

ENGINEERING CHEMISTRY

Time: 3 Hours                                                                                                                             Max. Marks: 100

Section-A

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Q.1 Attempt all parts. All parts carry equal marks.                                                                                                  (2×10=20)

1. On the basis of MOT, prove that the molecule of oxygen is paramagnetic in nature.
2. Describe the isomerism exhibited by maleic and fumaric acids.
3. What is chemical shift? Explain.
4. Define the terms chromophore and auxochrome in UV spectroscopy.

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5. What is inductive effect? Give any two examples where this effect is operative.
6. Explain why benzyl carbonium ion is more stable than ethyl carbonium ion.
7. Define reverse osmosis and calgon conditioning.
8. What are disadvantages of scale formation?
9. How will you synthesise orlon from acetylene?

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10. Differentiate between addition polymerization and condensation polymerization with suitable examples.

Section-B

Q.2 Attempt any five parts from this section.                                                                                                  (10×5=50)

1. With the help of molecular orbital diagram, calculate the bond order of the following: He₂⁺, O₂^2-, NO, HF and N₂^2-
2. Discuss in detail the case of an organic compound with two chiral centres.

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3. What is Beer Lambert law in UV-Vis absorption spectroscopy? A compound having concentration 10^-3 g/l resulted absorbance value 0.20 at the ?max 510 nm using 1.0 cm cell. Calculate its absorptivity and molar absorptivity values. Molecular weight of compound is 400/200.
4. Give the mechanism of SN¹ and SN² organic reaction.
5. Describe ion-exchange process of softening of water.
6. Write note on:
   (i) Reverse osmosis
   

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   (ii) Boiler corrosion
7. Describe the process of galvanization of iron. How does it prevent the corrosion of iron?
8. What is Ziegler-Natta catalyst? What is its significance in polymerization.

Section-C

Attempt any two questions from this section.                                                                                                  (15×2=30)

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Q.3

1. What are corrosion inhibitors? Explain with examples how anodic and cathodic inhibitors provide protection against corrosion.
2. Why is it convenient to express hardness of water in terms of CaCO₃ at the international level? Write other units also.

Q.4

1. Differentiate between
   

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   (i) Enantiomers and diastereomers
   (ii) Racemic mixture and Meso compounds
2. Write the preparation properties and uses of:
   (i) Silicone rubber
   (ii) PMMA
   

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   (iii) Bakelite

Q.5

1. Discuss the principle and application of NMR spectroscopy in structure determination of organic compounds.
2. Derive the rate expression for second order reaction, when the reactants are different.

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