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D 31785 (Pages : 2) வான. விதத்‌ வையக

THIRD SEMESTER (CBCSS—UG) DEGREE EXAMINATION
NOVEMBER 2022

Chemistry, Industrial Chemistry, Polymer Chemistry
CHE 3B 03—PHYSICAL CHEMISTRY—I
(2019 Admission onwards)
Time : Two Hours Maximum : 60 Marks

Section A (Short Answers)

Answer questions up to 20 marks.
Each question carries 2 marks.

1. Calculate the temperature at which RMS velocity of O, equals that of H, at 27 K.

2. The molecular diameter of He is 0.22 nm. Calculate mean free path of it at 10-6 torr and 298K.
(k = 1.38 x 10-23, JK“molecule” 1).

3. State first law of thermodynamics. Give its mathematical formulation.
4. State and illustrate Hess’s law.

5. State Le chateleirs principle with example.

6. What are the characteristics of chemical equillibrium.

7. Write Vant-Hoff s equation.

8. Explain K, in terms of K 0 explain terms.

9. Define symmetry elements and symmetry operation.

10. What is meant by point group ?
11. Give a single operation equivalent to combined operation 6,, and oy,.

12. Define principal axis.

(Ceiling of marks : 20)

Turn over

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