Q5/7E/04-15

Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 CH510 – INORGANIC CHEMISTRY - III Time : 3 hrs Max Marks :75 SECTION - A (20X1=20) Answer ALL Questions I. Choose the correct answer: 1. The coordination number of cobalt in [Co(en) 3]Cl2 is: a) 4 b) 6 c) 2 d) 4 2. The oxidation number of iron in the brown ring complex is: a) 0 b) +1 c) +2 d) +3 3. Which of the following exhibit linkage isomerism? a) [Co(en)3]Cl3 b) [Co(en)2py2]Cl c) [Co(en)2NO2Cl]Br d) [Co(NH3)5Cl]Br2 4. Which one of the following has the largest number of isomers? a) Ru(NH3)4Cl2]Cl b) [Co(en)2Cl2]Cl c) [Ir(PPh3)2h(CO)]Cl2 d) [Co(NH3)5Cl]Cl2 5. A complex of chromium obeys EAN rule. If chromium is in its zero oxidation state, the number of carbonyl groups attached to the metal in this complex is: a) 4 b) 5 c) 6 d) 10 6. The outer orbital complex among the following: a) K4[Fe(CN)6] b) [Ni(NH3)6]Cl2 c) [Co(NH3)6]Cl3 d) K4[Mn(CN)6]

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7. CN – is a strong field ligand. This is due to the fact: a) It forms high spin comples with metal species. b) It carries negative charge. c) It can accept electrons from metal species d) It is a pseudohalide. 8. According to the valence bond theory, the number of σ and π in Mn2(CO)10 is: a) 2, 10 b) 11, 10 c) 10, 10 d) 21, 20 9. Due to Frenkel defect, the density of the ionic solids: a) Increases b) Decreases c) Does not change d) Change 10. In a solid AB having NaCl structure, A atoms occupy the corners of the cubic unit cell. If all the face – centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is: a) A2B b) AB2 c) A4B3 d) A3B4 II. Fill up the blanks: 11. According to Werner theory, the primary linkage in a coordination compound is _______, and cooresponds to the ________ state of the compound. 12. The coodination numberof [Co(NH3)6 is ________. 13. [Co(NH3)6]Cl3 is an __________ orbital complex ; its magnetic property is _________. 14. Ligands arranged in the order of their increasing splitting ability is known as __________. 15. An electron trapped in anion vaccancy within the crystal is called ___________.

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III. Match the following COMPLEX

SHAPE

16. Tetraamminecopper (II) sulphate

i) Tetrahedral

17. Sodium dichlorocuperate (I)

ii) Equilateral

18. Pentaaquanitrosyliron (I) sulphate

iii) Tetrahedral

19. Bis(acetylactanato)oxovanadium (IV)

iv) Square planar

20. Ammonum tetrafluorocobaltate (II)

v) Square pyramidal vi) Octahedral vii) Linear

SECTION - B (10X2=20) Answer any TEN Questions 21. Define ‘ligand’. Give example. 22. Give a simple chemical test to distinguish between [CoBr(NH3)5]SO4 and [Co(NH3)5SO4]Br. 23. Arrange the following in the increasing order of molar conductane: a) [CoCl3(NH3)5] b) [CoCl(NH3)5]Cl2 c) [Co(NH3)6]Cl3 d) [CoCl(NH3)5]Cl 24. Discuss an inner orbital complex with an example. 25. Predict the shape of [Cr(NH3)6]3+ ion on the basis of valence bond theory. 26. What is spectrochemical series?

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27. What is chelate effect? 28. How many isomers are possible for one (MA2B2) type. Sketch them. 29. Non stoichiometric NaCl is yellow. Explain. 30. Discuss ‘F – center’ with an example. 31. Name two powerful trans directing ligands and two poor trans directing ligands. 32. Give two examples for bidentate ligands. SECTION - C (5X7=35) Answer any FIVE Questions 33. a) Explain linkage isomerism with an example. b) Discuss the types of octahedral complexes that can exhibit optical isomerism. (3+4) 34. a) Aqueous solution of Co(II) salts are pink; but, a solution of K2[CoCl4] is blue. Explain. b) Draw the diagram of {Co(EDTA)] – . c) A metal complex having composition Cr(NH3)4Cl2 Br has been isolated in two forms A and B. The form A reacts with AgNO3 to give a white precipitate readily soluble in aqueous ammonia, whereas B give a white precipitate soluble in concentrated ammonia. Identify A and B. (2+2+3) 35. a) The MnSO4 salt is dissolved in water. Calculate the CFSE value for the complex formed in aqueous solution. b) [Ti(H2O)6]3+ is colored while [Sc(H2O)6]3+ is colourless. Explain. c) How are low spin and high spin complexes formed? (2+2+3)

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36. a) Draw and discuss the salient feautures of the complex obtained in the identification of nickel ion. b) Write a scheme to separate and identify a given mixture of CuSO4 and CdC2O4. c) V(CO)6 ] is less stable than [V(CO)6 ]. Explain. (2+2+3) 37. a) How does the nature of the ligand affect the stability of the complex? b) The EAN of each Mn in its carbonyl Mn2(CO)10 is 36. Deduce and draw the structure of this carbonyl. Discuss its salient features. (4+3) 38. a) What is Frenkel defect? b) What is coordination number of Na+ and Cl – in rock salt structure? c) How does the electrical resistivity of semiconductor, metallic conductor and superconductor changes with temperature?(2+2+3) 39. a) Differentiate a metallic conductor and an insulator in terms of ‘Band Thoery’. b) Explain the electrical conduction mechanism of silicon doped with gallium. c) The composition of Fe0.93O. What percentage of iron is present in the form of Fe (III). (2+2+3)

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