مع مد عه ممع ع ووه ةج ول ا إل يان 86آ )2 : ‎D 92923 (Pages‏

THIRD SEMESTER (CBCSS-UG) DEGREE EXAMINATION, NOVEMBER 2020
Chemistry/Industrial Chemistry/Polymer Chemistry

CHE 3B 03—PHYSICAL CHEMISTRY - 1

Time : Two Hours Maximum : 60 Marks

Section A (Short Answers)

Answer at least eight questions.
Each question carries 3 marks.
All questions can be attended.

Overall Ceiling 24.

1. The density of O, at 298K and 1 atm is 1.429 gdm-3 Calculate the RMS velocity of O, at 275K.
2. For O, at 25°C calculate mean free path at | atm given d = 361 pm.
2. Define Cp and Cv of an ideal gas. How are they related ?

4. Calculate change in internal energy for conversionof 1 mol of H,O at 100°C to steam at 1 atm.
The heat absorbed and work done by system are 40.7 kJ and 3.1 kJ respectively.

5. How is entropy related to thermodynamic probability ? 5

6. What is meant by partition function ?

7. State Le chatliers principle.

8. Give relation between Kp and Kc and explain the terms.

9. Name point group to which NH, belongs. Write down its symmetry elements
10. What is an identity operation ?
11. What is meant by axis of symmetry ? Illustrate with an example.

12. What are the symmetry elements ?
(8 x 3 = 24marks)
Section B (Paragraph)

Answer at least five questions.

Each question carries 5 marks.

All questions can be attended.
Overall Ceiling 25.

13. Why Vander waals equation is applicable to real gases? Define compressibility factor and Boyle
Temperature.

14. Give a brief account of Maxwell’s distribution law of velocities.

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