2020 Indira Gandhi National Open University (IGNOU) JUNE TEE 2020 Che - 04 question paper model question papers



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

2020 B.Sc. Chemistry 2020 Indira Gandhi National Open University (IGNOU) JUNE TEE 2020 Che - 04 question paper Question paper



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

Are you currently in the BSc course of Indira Gandhi National Open University (IGNOU)? Here is the question paper of TEE 2020 JUNE Che-04 question paper. You can take a step forward in your preparation with the help of these question and this is a free pdf so feel free to download it.



CHE - 04 TEE JUNE 2020
Use of log tables and non-programmable calculators is allowed.
R = 8.314 JK-1mo1-1, NA = 6.022 x 1023mo1-1.
Part-A [1 each]
Note: Answer any five of the following questions.
Q1. Write the S. I. units of gas constant, R. 0
Q2. Define vapour pressure.
Q3. What is an isothermal process?
Q4. Define enthalpy of neutralization.
Q5. State Raoult's law.
Q6. What is a buffer solution?
Q7. What do you understand by "order of a reaction"?
Part—'B [2 each]
Note: Answer any five of the following questions.
Q8. A vessel of 2 x 10-3 m3 volume contains 0.036 kg of Argon at 300 K. Calculate its pressure using ideal gas equation. (Atomic mass of Ar = 39.9 u).
Q9. In a polythene tube, water meniscus is convex. Explain.
Q10. Calculate the entropy of fusion of benzene solid, if its melting point is 280 K and its enthalpy of fusion is 11 kJ mol-I.
Q11. The edge length of a cubic unit cell is 5.63 x 10-w m. Find the distance between (111) planes.
Q12. What do you understand by the term "Colligative Property"? Name any two of them. [3]
Q13. Consider the reaction: PC15(g) PC13(g) + C12(g) How will the equilibrium be affected by:
(i) addition of C12
(ii) decrease in volume of container?
Q14. Among ethanol and dimethyl ether, which one has higher boiling point? Give reasons for your answer.
Part—C [3 each]
Note: Answer any five of the following questions.
Q15. Derive the integrated rate law for a zeroth order reaction of the type A -) products.
Q16. Nickel metal packs in a cubic unit cell with an edge length
(a) of 3.5 x 10- 10m. The density (p) of nickel is 8.9 x 103kg m-3. Find the type of unit cell. Atomic mass of nickel = 58.7 u.
Q17. Derive the following Maxwell relation: (aT av) _ as) s- (as) v • starting from dU = TdS - pdy.
Q18. With the help of a suitable diagram describe the glass electrode.
Q19. The boiling point of chloroform was raised by 0.30 K when 5 x 10-4 kg of an organic compound was dissolved in 3 x 10- 2kg of chloroform. Calculate the molar mass of organic compound. Molal elevation constant for chloroform is 3.9 K kg mol-1. 3
Q20. For the reaction
N204 (g) = 2NO2(g) Kp =,1.4 x 104Pa at 303 K.
Find the value of & at this temperature.
Q21. State the differences between fluorescence and phosphorescence.
Part—D [4 each]
Note: Answer any five of the following questions.
Q22. Explain the Linde's process of liquefaction of gases. Also draw the schematic diagram of the equipment used.
Q23. Starting from G = H — TS, derive the Gibbs Helmholtz equation: [ a (GET)) aT T2
Q24. Estimate the standard enthalpy of formation of acetone vapour. Given the following information: B (H — H): 436 kJ mo1-1 B (0 = 0): 497 kJ mo1- 1 B (C— H): 412 kJ mol-1 B (C — C): 348 kJ mol-1 B (C = 0): 745 kJ mo1-1 ' atom— w (graphite) = 717 kJ mo1-1.
Q25. Draw and explain the phase diagram of a simple eutectic system.
Q26. What are emulsions? Give their types and importance.
Q27. What is common-ion effect? Explain using an example. Discuss its application in salt analysis.
Q28. What is the sign of cell potential, for a particular reaction to be spontaneous? State whether the following are spontaneous or not:
(1) Fe + 2H+ Fe 2+ + H2 E° —Fe = -0.44 V 2+ /Fe
(ii) Cu + 2H+ Cu2+ + H2 cu2+Icu = 0.34 V
(iii) 2Fe3+ 21- 2Fe2+ + 12 E° 0.54 Fes+ /Fe2+ E° = — 0.77 V 7060





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