J6U1/7N15 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 PCH702S – INORGANIC CHEMISTRY - I

Time : 3 hrs

MaxMarks :75 SECTION –A (20X1=20) Answer ALL Questions

I. Choose the best Answer 1. Which one of the following complexes exhibits chirality? a) [Cr(ox)3]3b) Cis - [Ptcl2 (en)] c) Cis - [RhCl2(NH3)4 d) Meso - [Co(NO2)3 (triene)] 2. Which type of isomerism is shown by [Co(NH3)4]Cl2? a) Geometrical and ionisation b) Optical and ionization c) Geometrical and optical d) Geometrical only 3. CFSE value of [Mn(H2O)6]2+ is a) 0.00 b)-0.4 c) -0.6

d) -1.24

4. According to CFT, Which one of the following is paramagnetic? a) [Fe(CN)6]4b) [Fe(CN)6]33 c) [Co(NH3)6] d) [Ni(CN)4]25. Which one of the following is not a correct statement regarding stability of complexes? a) The higher the value of K, the greater will be the stability of the complex. b) Metal ions with large size from stable complexes. c) Highly basic ligands from stable complexes. d) The stability of the complexes increases with the number of chelate ring.

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J6U1/7N15 6. Value of stepwise stability constants generally a) Increases c) Some time increases, some time decreases

b) Decreases d) None of these

7. Which of the following is an example of close structure borane? a) B2H52b) B2H6 c) B5H9 d) B4H10 8. The structure of Co4(Co)12 is a) Tetrahedron c) Square

b) Closed triangle d) Trigonal bipyramind

9. Which of the following is a superconductor at very low temperature? a) S4N4 b) S4N2 c) S4N4 So3 d) BF3 10. Which one of the following heteropolyacid has Dawson structure? a) H6P2Mo18O62 b) H3PMO12O40 c) H4SiMo12O40 d) H3AsM12O40 II. Fill in the blanks 11. Optical rotation as a function of wavelength is known as _________. 12. The crystal filed stabilisation energy for high spin d6 system in Oh and Td fields are ________and ________. 13. Thermodynamic stability is related to _________. 14. The bond order of the metal - metal bond in [Re2Cl8]2- is 15. S2N2 chains have _____ shape. III. Match the following 16. [Cr(NH3)4 Cl2]Cl

- a) 62

17. Kinetic stability

- b) Non bonding

18. t2g orbitals in Oh

- c) Tetrahedral

19. [Fe4(Co)12C]2-

- d) Geometrical isomerism

20. Silicate

- e) Activation energy

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J6U1/7N15 SECTION – B (10X2=20) Answer any TEN Questions 21. State cotton effect. 22. Show diagrammatically cis and trans forms of [Co(NH3)4 Cl2]+. 23. What are macrocylic ligands? give two examples. 24. [Fe(CN)6 ]4- is diamagnetic where as [Fe(F)6 ]3- is paramagnetic why? 25. Write the differences between thermodynamic and kinetic stability. 26. Why do chelated complex are most stable than non chelated complex? 27. Draw the structure of Ir4CO12. 28. What is a metal cluster? How are metal clusters classified? 29. Give the general formulae of closo and nido boranes. 30. How do iso and hetropoly ions react with isocynates? 31. Illustrate ionization isomerism. 32. Calculate the crystal filed stabilization energy (CFSE) for a metal ion of d6 configuration in the presence of weak filed. SECTION – C (5X7=35) Answer any FIVE Questions 33. i. Explain the following with examples. a) Linkage isomerism and coordinate isomerism. ii. Describe the geometrical isomerism exhibited by [Ma3b3] type.

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J6U1/7N15 34. i. Sketch five d orbitals and label them. What is the degeneracy of the d orbital? How is the d generacy lift up in octahedral and tetrahedral fields? (4) ii. Explain the structure and stability of metal complexes of crown ethers. (3) 35. i. How can the stability constant be measured by BJerum method? (4) ii. Explain the factors affecting the stability constant referring to nature of the metal ion. (3) 36. i. Sketch the structure of B5H11 and applying wade's rule calculate the number of electrons. (4) ii. Discuss the structure Fe3CO12. (3) 37. i. Name any two isopoly acids of molybdenum and chromium and describe their structures. (4) ii. Describe the structure of S4N4. (3) 38. i. What are silicates? Describe their properties. ii. Describe the structure of Mo2 Cl82-.

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39. i. By citing an example explain the splitting pattern of d orbitals in square planar complex. (4) ii. Write the difference between stepwise and overall formation constant. (3)

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