Indira Gandhi National Open University Chemical IGNOU TEE 2018 December Che - 04 (physical chemistry)question paper model question papers

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Posted Date: 29 May 2021      Posted By:: Shubham Jain    Member Level: Silver  Points: 3 (₹ 2)

2018 Indira Gandhi National Open University Chemical B.Sc Chemistry (Hons) IGNOU TEE 2018 December Che - 04 (physical chemistry)question paper Question paper

Course: B.Sc Chemistry (Hons)   University/board: Indira Gandhi National Open University

If you are preparing for the TEE exams of Ignou and you are in BSc course. Here is the question paper of 2018 Tee exam of December session. Feel free to download it and take a one step forward in your preparation journey.

Attempt any five questions:

Q1. What is the SI unit of work?

Q2. State the first law of Thermodynamics in any one way?

Q3. If Kp>1 for a reaction, comment on the sign of standard free energy change of the reaction.

Q4. State Kohlrausch's law of independent migration of ions.

Q5. State distribution law for the distribution of solute between two immiscible solvents.

Q6. Draw the graph of [A]t vs t for a first order reaction.

Q7. State Konowaloff's rule

Attempt any five questions:

Q8. Calculate the roots mean square speed of hydrogen molecules at 500K. Molar mass of hydrogen is 0.002 kg mol-1 and R = 8.314 J mol-1 J mol-1 K-1.

Q9. Ethanol has higher boiling point than butane although the latter has higher relative molecular mass, Explain

Q10. Addition of NaCl solution to gold sol results in its coagulation but if this reaction is carried out in the presence of a certain amount of soluble starch, precipitation of gold does not take place Explain.

Q11. Calculate the entropy of vaporization of water at 400K, if the molar enthalpy of vaporization is 40.6 KJ mol-1.

Q12. Which of the following will exert greater osmotic pressure and why 0.1 M sodium chloride or 0.1 M sucrose?

Q13. What is common in effect? Explain with the help of an example.

Q14. The limiting molar conductivities of KCl, KNO3, and AgNO3 are 1.499×10-2 S m2 mol-1, 1.45×10-2 S m2 mol-1 and 1.33×10-2 S m2 mol-1. What is the limiting molar conductivity of AgCl at this temperature?

Attempt any five questions:

Q15. State Hess's law. Calculate ?rHo for the reaction
C (graphite) + ½ O2 (g) ? CO (g)
At 298 K using the following thermochemical equations:
CO (g) + ½O2 (g) ? CO2 (G), ?rHo =-393.5 KJ
CO (g) + 1/2 O2 (g) ? CO2 (g) ?rHo = -283.5 KJ.

Q16. Show that for a simple cubic cell, the ratio of the volume occupied to the volume of unit cell is 0.52

Q17. Starting from the equation H = U + pV, show that Cp-Cv = nR.

Q18. Solid C, CaO and CaCO3 are mixed and allowed to attain equilibrium at 100 K. What is the pressure of CO? Given the following information:
CaCO3 (s) ? CaO (s) + CO2 (g) Kp = 4×103 Pa
C (s) + CO2 (g) ? 2CO (g) K'p = 2×105 Pa

Q19. Can azeotropes be separated into pure components by fractional distillation? Explain using a suitable diagram.

Q 20. Discuss the inhibition and poising of catalyst by giving suitable examples.

Q21. A radiation of 250 nm incident on HI results in the decomposition of 1.85×10-2 mol within a particular time interval. Light energy absorbed during this time interval is 4.18 KJ. Calculate the quantum efficiency for the decomposition of HI.

Attempt any five questions:

Q22. An aqueous solution prepared by dissolving 0.5 kg of KC1 (molar mass = 7.45 x 10-2kg mol) in 100 kg of water was found to freeze at 272.76 K. Calculate the van't Hoff factor and degree of dissociation of solute. Kf(H20) = 1.85 K kg mol-1 If(H20) ='273 K.

Q23. Draw and discuss the phase diagram of water

Q24. Write shot note on any two of the following:
(a) Dipole-dipole interactions
(b) Dipole-induced dipole interactions
(c) London dispersion forces

Q25. Discuss the phenomenon of fluorescence giving a suitable diagram.

Q26. The saponification of methyl acetate by sodium hydroxide was studied at 298 K. Initial concentration of ester and alkali were both 1.00 x 10-2M. Rate of reaction was followed by titration against standard HC1. Concentration of unreacted alkali [A]tis as follows:
Time/s 240 550 720
103[A]t/M 6.85 4.81 4.17
Calculate second order rate constant.

Q27. 7. Derive the following Maxwell relation:
(delta S/ delta V) t = (delta P/ delta T) v

Q28. Calculate the equilibrium constant (as log K) at 298 K for the reaction taking place in cell
Al (s) I A134-(C1) II Cu +(C2) I Cu (s)
E° Al3+1A1 = —1.66 V; E0 z, + = 0.34 V

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