F4/PG1/15/A16 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001

PCH1014 - INORGANIC CHEMISTRY – IV Time : 3 hrs Max Marks :75 SECTION – A (20X1=20) Answer ALL Questions I. Choose the correct answer 1. What is the mechanism of reaction of Square planar complexes? a) SN 1 b) SN 2 c) SN 1 CB d) Ion pair 2. The labile complex is a) [Co(NH3)6]3+ c) [Fe(CN)6]3-

b) [Fe(CN)6]4d) [CoF6]3-

3. Cis-[PtCl2(NH3)2] is treated with tu. The final product is a) [Pt(tu)4]2+ b) [PtCl2(tu)2] c) [Pt(NH3)2(tu)2]2+ d) None of the above 4. The mechanism of the reaction between [Fe(CN)6]4- and [Fe(bpy)3]3- (where pby is 2,2-bipyridine) is a) Outer sphere mechanism b) Inner sphere mechanism c) Self exchange reaction d) Ligand exchange followed by electron transfer reaction 5. Cis and trans complexes of the type [PtA2X2] are distinguished by a) Chromyl chloride test b) Carbylamine test c) Kurnakov test d) Ring test 6. Due to Laporte rule forbidden d-d transition , quantum yield of photo- substitution reaction are a) Very high b) Very low c) Zero d) 100

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7. Defect found in ZnO is a) Schottky defect c) Frenkel defect

b) Vacancy defect d) None of the above

8. The frenkel defect is a combination of vacancy and _______ defects a) Vacancy b) Intertitial c) Filled d) None 9.

Graphite is used as a a) Insulator b) Semiconductor

c) Lubricant

d) None

10. Edge dissociation is a type of _________ defects a) Line defects b) Point defects c) Plane defects

d) None

II. Fill up the blanks 11. The electron transfer reaction between [Co(NH3)5Cl]2+ and [Cr(H2O)6]2+ in acidic medium leads to the formation of a chromium species of formation _________ 12. Reaction of [Co(H2O)5Cl]2+ by Cr2+(aq) leads to the formation of [Cr(H2O)5l]2+. This is an example of _______ 13. [Cr(H2O)6]3+ is a __________ complex. 14. Boron group elements doped with carbon group elements gives a ___________ semiconductor. 15. For anti – ferromagnetic substances, there is a characteristic temperature known as__________. III. Match the following 16. Labile complex

- a) Cis-platin

17. Super conductors

- b) Insulators

18. Schottky defect

- c) zero resistivity

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19. Diamond

- d) point defect

20. Anticancer drug

- e) [Mn(H2O)6]3+ SECTION – B (10X2=20) Answer any TEN Questions

21. [Cr(H2O)6]3+ is inert whereas [Cr(H2O)6]2+ is labile to ligand substitution reactions – Explain. 22. What is acid hydrolysis reaction? 23. Arrange the following in increasing order of trans effect: NH3, tu, CN- and Cl24. What is a complimentary electron transfer reaction? 25. Define cis effect. 26. The reaction of [PtCl4]2- with NH3 gives product A while its reaction with [NO2]- followed by NH3 gives product B. What are the products A and B? 27. What are photoisomerisation reactions? 28. Write about Schottky defect. 29. What are n-type semiconductors? 30. What is meant by colour centres? 31. Define photoelectric effect. 32. Explain two consequences of metal deficiency defects.

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SECTION- C (5X7=35) Answer any FIVE Questions 33. a) Explain the mechanism of base hydrolysis of [Co(NH3)5Cl]2+ b) Explain the synthesis of Trans-platin by substitution reactions. (4+3) 34. a) What is Trans effect? Explain the kinetic trans effect. b) Write a note on Photoredox reaction of [Ru(bipy)3]2+.

(4+3)

35. a) What is outer sphere mechanism of electron transfer reaction? b) Explain the Inner sphere mechanism of electron transfer reaction involving a 6-coordinatned complex. c) Write down the Marcus equation. (2+3+2) 36. a) What are line and plane defects? b) Explain briefly on metal excess defect with an example.

(4+3)

37. a) With the help of band theory explain conductors and insulators. b) Write a note on p-type semiconductor. (4+3) 38. a) Write a note on associative mechanism in square planar complexes by taking one example. b) Explain the application of metal complexes in solar energy conversion. (3+4) 39. a) What are superconductors? Explain with two examples. b) Write a note on Ferro and Ferrimagnetism.

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