Q7/15P/11-12 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 PCH702S - INORGANIC CHEMISTRY - I Time : 3 hrs Max Marks :75

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SECTION – A (20X1=20) Answer ALL Questions I. Choose the correct answer 1. Which of the following complexes are optically active b) Trans [Co(en) 2 Cl 2 ] a) [Co(ox) 3 ] c) Trans [Co(pn) 2 Br 2 ] d) Trans [Ni(pn) 2 Br 2 ] R

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2. Which one is more labile complex a) [Co(en) 3 ] 3+ b) Co(pn) 3 ] 3+ 3CoF 6 ] R

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c) Co(CN) 6 ] 3-

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d) [

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3. The kinetic formation of metalloporphyrins, the order of metal ion is a) Cu +2 >Co 2+ > Fe 2+ >Ni 2+ b) Cu +2 >Fe 2+ > Co 2+ >Ni 2+ d) Co +2 >Cu 2+ > Fe 2+ >Ni 2+ c) Cu +2 >Ni 2+ > Fe 2+ >Co 2+ P

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4. Sueeessive stability constants of ‘en’ complexes with a metal ion are: log K 1 = 2.5, log K 2 = 1.7 and log K 3 = 0.8 therefore, the over – all stability constant is a) 5 b) 104.2 c) 10 5 d) none of the above R

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5. Among the following, the most stable complex is b) [Co(en) 2 (H 2 O) 2 ] 3+ a) [Co(en)(H 2 O) 4 ] 3+ 3+ c) [Co(NH 3 ) 6 ] d) [Co(en) 3 ] 3+ R

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6. The 1:1 ratio complex, the concentration of total metal ion is a) [M] + [ML] + [ML 2 ] b) [M] + [ML] c) [M] d) [M] + [ML] + [ML 2 ] +[ ML 3 ] R

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7. The kind of isomerism illustrated by complexes containing diaminopropane as one of the ligands is a) Linkage isomerism b) Polymerisation isomerism

~1~

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c) Ionization isomerism d) Ligand isomerism 8. Tremolite containing the basic unit of a) Si 4 O 11 -6 b) W 4 O 11 -6 c) Si 6 O 13 -6 d) P 4 O 11 -6 R

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9. Tetrasulphur tetranitride with tin(II) chloride to produce a) Tetrasulphur tetraimide b) Trisulphur tetraamide c) Disulphur tetraimide d) Tetrasulphur tetraamide 10. Assuming that this complex obeys EAN rule, what is the fomula for a carbonyl complex of Mn, (CO) X Mn-Mn(CO) X where there is a single covalent bond between the two Mn atoms. a) Mn 2 (CO) 10 b) Mn 2 (CO) 8 c) Mn 2 (CO) 12 d) none of the above R

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II. Fill up the blanks 11. The name of the complex [Co(en) 3 ][Cr(C 2 O 4 ) 3 ] is __________ R

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12. B 2 H 6 +NH 3 →___________ R

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13. [Co(NH 3 ) 4 (H 2 O)Cl] Br 2 and [Co(NH 3 ) 4 Br 2 ] Cl.H 2 O are said to R

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illustrate both ______________ and ______________. 14. Most common structure exhibited by B 12 H 12 R

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2RP

is ____________

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15. The observed magnetic moment of [Mn(NCS) 6 ] is 6.06 µB and the 4-

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electronic configuration of Mn in the complex is _____________ III. Match the following 16. 17. 18. 19. 20.

[Pt(NH 3 ) 4 ][PtCl 4 ] Central metal ion Octahedral cluster Paratungstate Diheteropoly acids R

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HW 6 O 21 -5 [P 2 W 18 O 62 ] -6 Polymerisation isomerism More electronegativity Mo 6 Cl 12 R

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SECTION – B (10X2=20) Answer any TEN Questions

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Q7/15P/11-12 21. Classify the following boranes and carboranes in to close, nido &

arachano. i) B 5 H 5 2- ii) B 10 C 2 H 12 iii) C 2 B 4 H 10 iv) B 3 H 7 22. For each metal ion listed, predict which of the ligands would give more stable complex and explain your choice i) Cr 3+ with NH 3 or CO ii) Cd 2+ with Br - or F R

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23. Differentiate the macrocyclic ligand porphyrin from corrin 24. Why transition metal ions complexes are color in nature? 25. Draw the d-orbital splitting pattern in square planar complexes and

give reason for that pattern. 26. Define Beer’s law. -3

27. Why [Fe(CN) 6 ] complex has higher stability constant than R

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-2

[Fe(CN) 6 ] complex? R

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28. Discuss the bonding in B 2 H 6 with regard to MOT R

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forms sheets and chains but Mo 7+ ions forms Poly anions, although both of them are having almost same ionic radii. Why?

29. Al

3+

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30. Complete the following reactions

a) P 4 O 6 R

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b) P 4 O 10 + 6H 2 O

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→

31. What are amphiboles? Give example. 2-

32. Draw the structure of [Re 2 Cl 8 ] . R

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SECTION - C (5X7=35) Answer any FIVE Questions 33. a) How are the following pairs of complexes differentiated?

i) [Co(NH 3 ) 5 Br] SO 4 and [Co(NH 3 ) 5 SO 4 ]Br (2) ii) [Cr(H 2 O) 6 ] Cl 3 and [Cr(H 2 O) 4 Cl 2 ] Cl.2H 2 O (2) iii) [Pd(NH 3 ) 2 (SCN) 2 ] and [Pd(NH 3 ) 2 (NSC) 2 ] (2) b) Trien is more suited to a ________ arrangement than for a R

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tetrahedral one

(1)

34. a) For each of the following sketch the arrangement of the d

orbitals and put in electrons appropriately. (5) i) [Cr(CN 6 )] 3ii) [FeF 6 ] 3iii) [Co(NH 3 ) 6 ] 3+ iv) [Ni(NO 2 ) 4 ] 2v) [Co(CN) 5 ] 3b) Why bidentate ligand metal complexes posses high stability constants than monodentate ligand metal complexes. (2) R

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35. a) Differentiate thermodynamic template effect from kinetic

template effect with suitable examples b) How will you determine the stability constants of metal complexes by potentiometric method. 36. a) Give the prepration of orthocarborane

(4) (3) (1)

b) How will you convert orthocarborane into meta and para carborane. c) Draw the structure of any one of the ferrocene analogue metallocarboranes

(4) (2)

37. a) Give the preparation of para and meta tungstate iso polyanions

(2) b) Differentiate meta tungstate iso polyanions from para tungstate iso polyanions with suitable diagram (4) c) Give one example for heteropolyanion (1) 38. a) Explain the methods used in the determination of absolute

configuration of complexes. (4) b) Draw the structure of Co 4 (CO) 12 and Fe 3 CO 12 and calculate the EAN for the metal atoms present in the clusters. (3) R

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complex, V0 = 21150 cm -1 and electron pairing energy E p =27750cm -1 . Will it be a high – spin complex or low-spin complex? Calculate its CFSE. Find out the “spin-only” magnetic moment of that complex ion. (4) b) What is spectrochemical series? Why is it so called? (2) 2c) Draw the optical isomers of [Zn-EDTA] (1)

39. a) For an octahedral Mn

3+

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