Download JNTUA B.Tech 1-1 R19 2020 January 19A51102T Chemistry Question Paper

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Code: 19A51102T

Time: 3 hours

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B.Tech I Year I Semester (R19) Regular Examinations January 2020

CHEMISTRY

(Common to CSE and IT)

PART - A

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(Compulsory Question)

1. Answer the following: (10 X 02 = 20 Marks)

1. Write Schrodinger equation.
2. Write the electronic configuration and bond order of O₂⁺.
3. Calculate the electrode potential of copper, if the concentration of CuSO₄ is 0.1 M. Given that E°Cu²⁺/Cu = + 0.34 V

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4. Define battery? Give examples for secondary battery.
5. What is stereospecific polymerization?
6. What is meant by functionality?
7. What is the importance of fingerprint region in IR spectrum?
8. State Beer's - Lambert's law of absorption.

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9. Define the term catenanes.
10. Explain the role of supramolecules as switching devices.

PART - B

(Answer all five units, 5 X 10 = 50 Marks)

UNIT - I

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2. Discuss the molecular orbital diagram of CO and find out its bond order.

3. (a) Explain wave nature of electrons.

OR

(b) Discuss p-molecular orbitals of benzene.

UNIT - II

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4. (a) Derive Nernst equation for an electrochemical cell.

(b) Explain the working of methanol fuel cells.

OR

5. (a) Explain conductometric titration of strong acid and strong base with example.

(b) What is electrochemical sensor? Explain amperometric sensors with examples.

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UNIT - III

6. (a) Explain the preparation and applications of urea-formaldehyde.

(b) Write a short note on chain growth and step growth polymerization.

OR

7. (a) Explain the conducting behaviour of polyaniline.

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(b) Discuss any one mechanism of polymer formation.

UNIT - IV

8. (a) Explain IR spectrophotometer with instrumentation.

(b) Discuss the principle involved in HPLC.

OR

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9. (a) Explain the principle of NMR spectroscopy.

(b) Describe in brief the terms: (i) Auxochrome. (ii) Chromophore.

UNIT - V

10. Explain briefly about basic lock and key mechanism principle of supramolecules.

OR

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11. (a) Write a note on self-assembly in biological systems.

(b) Explain the role of supramolecules as catalysts.

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