Guru Nanak Dev University 2005 B.Sc Chemistry PHYSICAL (Chemical Thermodynamics) Chem-103 -2k5 - Question Paper
Tuesday, 22 January 2013 08:30Web
B.Sc. (H.S.) In Chemistry first Semester
2125
PAPER - Chem-105
Physical Chemistry (Chemical Thermodynamics)
Time Alllowed : three hours
Maximum Marks : 75
Log tables and non-programmable calculators are not allowed
part - A ( 10 x 1(1/2) )
Atttempt All ques.
1. describe open system. Write its examples.
2. What is meant by term heat capacity? Write expressions for the heat capacities at constant quantity and pressure.
3. describe standard state.
4. Write the statement of Hess's legal regulations.
5. What is Claussius inequality? Write its significance.
6. discuss Enthalpy of neutralization with suitable examples.
7. Write the statement of Le Chateleir's principle.
8. describe the term phase, with suitable example, in phase rule.
9. Mention thermodynamic concepts of mass and molar mass.
10. Distinguish ranging from atmospheric and osmotic pressures.
part - B ( eight x 4(1/2) )
Attempt any 8 questions, every ques. carries equal marks.
1. Show that dE is an exact differential whereas dw and dq are not.
2. State and discuss 1st legal regulations of thermodynamics.
3. Derive the expression for the Work Done in case of adiabatic reversible expansion of an ideal gas.
4. State and illustrate Nernst heat theorem.
5. Write the statements of 2nd legal regulations of thermodynamics.
6. Write about the concept of residual entropy.
7. Derive Claussius-Clapeyron formula.
8. Deduce thermodynamic derivation of legal regulations of mass action.
9. compute the heat of vaporisation of benzene at 80"C if its molal boiling point elevation constant is 2.63
10. discuss thermodynamic scale of temperature.
11. refer to attachment
12. Write about degree of dissociation and association of solutes with suitable examples.
part - C
Attempt any 2 ques.. every ques. carries equal marks.
1. (a) Draw Carnot cycle. Show that the Work done in this cycle is
maximum.
(b) refer to attachment
2. (a) Establish thermodynamic relationship ranging from molecular weight of a non-volatile solute and depression of freezing point of a solvent.
(b) compute the work done, w if 1 mole of an ideal gas is expanded isothermally and reversibly at 37"C (degree celsius) from a quantity of 3.2 litres to 6.4 litres.
3. (a) Show that the Joule-Thompson expansion is isenthalpic as well as adiabatic.
(b) explain the application of phase rule for water system.
4. (a) Derive Gibbs-Duhem formula.
(b) State and discuss Raoult's legal regulations of relative lowering of vapour pressure.
Section B
11. Calculate the degrees of freedom for the following systems :
(i) N2(g) + 3H2(g) ↔ 2NH3(g)
(ii) NKCl and NaBr dissolved in H2O
(iii) CaCO3(s) ↔ CaO(s) + CO2(g)
Section C
1. (b) Deduce the relation Cp Cv = nR an ideal gas.
| Earning: Approval pending. |
