Bsc 3rd semester chemistry (core) examination question paper (calicut university) sept. 2012
* time: 3 hours
*sub: physical chemistry
*weightage:30
section A
Fill in the blanks : (12*1/4=3 weightage)
1. For ideal gas C(p,m)-C(v,m)=....
2. The efficiency of a carnot cycle is...
3. Pc in terms of vander waals constan is...
4. Surface tension....with rise in temperature
State whether true or false :
5. Electrons and alpha particle are examples for fermions.
6. The boiling point of water increases with increase of atmospheric pressure.
7. Heat, internal energy, free energy are state functions of the thermodynamic system.
8. Below the boyle temperature gases behave ideally.
ANSWER IN A WORD OR SENTANCE
9. How is entropy and thermodynamic probability related?
10. Write down the gibbs-duhem equation.
11. State le chatelier principle.
12. Define vapour pressure.
SECTION B (9*1=9 weightage)
13. Differentiate between average and most probable velocity.
14. The viscocity of a gas in independent of pressure.
15. What is compressibility factor?
16. What is optical exaltation?
17. Third law of thermodynamics.
18. What do you mean by chemical potential?
19. Calculate the entropy change whe 1mole of H2 is mixed with 1 mole of He, both gases being at the same P and T.
20. What is meant by residual entropy?
21. Explain joule-thomson effect.
SECTION C (5*2=10 weightage)
22. What is parachor? How is it used in structre elucidation?
23. How will you experimentally determine the critical constant of a gas.
24.Explain the criteria for spontaneity.
25. Derive the gibbs-helmhotz equation.26. Calculate the change in freezing point of ice when the pressure is increased by 1 atm. Molar volumes of water and ice are 18cm^3 and 19.6 cm3.and the enthalpy of fusion for ice is 6008j mol-1.
27. Using partition function write expressions for molar heat capasity cv, entropy, pressure and enthalpy.
28. Will the addition of cl2 to the reaction mixture.</br>4HCL+O2--> 2Cl2+2H2O change the equilibrium constant and why?
SECTION D (2*4=8 weightage)
29. Why do real gases deviate from ideal behaviour? Derive the van der waals equation for n moles of a gas.
30. Derive the clausius-clapeyron equation. Explain any two application
31. How is equilibrium constant related to the standard free energy change of the reaction? Derive the relations between Kp, Kc, and Kx.
* time: 3 hours
*sub: physical chemistry
*weightage:30
section A
Fill in the blanks : (12*1/4=3 weightage)
1. For ideal gas C(p,m)-C(v,m)=....
2. The efficiency of a carnot cycle is...
3. Pc in terms of vander waals constan is...
4. Surface tension....with rise in temperature
State whether true or false :
5. Electrons and alpha particle are examples for fermions.
6. The boiling point of water increases with increase of atmospheric pressure.
7. Heat, internal energy, free energy are state functions of the thermodynamic system.
8. Below the boyle temperature gases behave ideally.
ANSWER IN A WORD OR SENTANCE
9. How is entropy and thermodynamic probability related?
10. Write down the gibbs-duhem equation.
11. State le chatelier principle.
12. Define vapour pressure.
SECTION B (9*1=9 weightage)
13. Differentiate between average and most probable velocity.
14. The viscocity of a gas in independent of pressure.
15. What is compressibility factor?
16. What is optical exaltation?
17. Third law of thermodynamics.
18. What do you mean by chemical potential?
19. Calculate the entropy change whe 1mole of H2 is mixed with 1 mole of He, both gases being at the same P and T.
20. What is meant by residual entropy?
21. Explain joule-thomson effect.
SECTION C (5*2=10 weightage)
22. What is parachor? How is it used in structre elucidation?
23. How will you experimentally determine the critical constant of a gas.
24.Explain the criteria for spontaneity.
25. Derive the gibbs-helmhotz equation.26. Calculate the change in freezing point of ice when the pressure is increased by 1 atm. Molar volumes of water and ice are 18cm^3 and 19.6 cm3.and the enthalpy of fusion for ice is 6008j mol-1.
27. Using partition function write expressions for molar heat capasity cv, entropy, pressure and enthalpy.
28. Will the addition of cl2 to the reaction mixture.</br>4HCL+O2--> 2Cl2+2H2O change the equilibrium constant and why?
SECTION D (2*4=8 weightage)
29. Why do real gases deviate from ideal behaviour? Derive the van der waals equation for n moles of a gas.
30. Derive the clausius-clapeyron equation. Explain any two application
31. How is equilibrium constant related to the standard free energy change of the reaction? Derive the relations between Kp, Kc, and Kx.
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