<p> Chem 451 (Spring, 2003) Exam II (100 pts) Name: ------, SSN: ------, March 28, 2003 LAST, First Circle the alphabet segment of your Last Name: A-G H-L M-P Q-Z</p><p>Please answer the following questions: Part I: Multiple Choice (30 pts: 6 @ 5 pts). Please circle the ONE best answer:</p><p>1. Which one of the following has the largest CFSE?</p><p>3+ 3+ a) [Co(CN)6] b) [Cr(NH3)6] </p><p>2+ 2+ c) [Ni(NH3)6] d) [Mn(H2O)6]</p><p>2. What are the types of isomerism may arise in each of the following pairs?</p><p>[Co(NH3)3(NO2)3] & [Co(NH3)6][Co(NO2)6]; [Co(NH3)5(NO2)]Cl2 & [Co(NH3)5(ONO)]Cl2; [Co(NH3)5(SO4)]Br & [Co(NH3)5Br]SO4</p><p> a) Coordination, linkage and hydration, respectively b) Polymerization, linkage and ionization, respectively </p><p> c) Coordination, linkage and geometrical, respectively d) Polymerization, geometrical and ionization, respectively</p><p>2- 3. Predict how many unpaired electrons are in [PtCl4] (square planar)? a) 4 b) 2 c) 0 d) non of the above</p><p>4. For which member of the following pairs of complexes would ∆oct be the larger?</p><p>2+ 2+ 2+ 3+ 2- 2- [Ni(H2O)6] & [Ni(en)3] ; [Cr(H2O)6] & [Cr(H2O)6] ; [MnF6] & [ReF6] ;</p><p>2+ 2+ 2- a) [Ni(H2O)6] , [Cr(H2O)6] , [MnF6] , respectively</p><p>2+ 2+ 2- b) [Ni(en)3] ; [Cr(H2O)6] [ReF6] , respectively</p><p>2+ 3+ 2- c) [Ni(en)3] , [Cr(H2O)6] , [MnF6] , respectively</p><p>2+ 3+ 2- d) [Ni(en)3] , [Cr(H2O)6] ,[ReF6] , respectively</p><p>5. Which of the following complexes would show Jahn Teller Effect?</p><p>2+ 3+ 2+ 2+ a) [Ni(H2O)6] b) [Cr(H2O)6] c) Zn(NH3)6] d) [Cr(H2O)6]</p><p>6. Which of the following species is expected to be diamagnetic?</p><p>2- 2+ a) [CoCl4] b) [Co(en)3]</p><p>1 3- 4- c) [Fe(CN)6] d) [Fe(CN)6] Part II. (40 pts: 5 @ 8 pts): 1. Write the formula for Tetraamminechromium(III)-μ-amido-μ-hydroxobis(ethylendiamine)iron(III) sulfate</p><p>2. What is meant by chelate effect? Give a brief account for Template synthesis:</p><p>3. Sketch and state ALL the types of isomerism that may be exhibited by Na[Fe(ox)2(H2O)2] (ox = 2- oxalate ion = C2O4 ). Also, give the name of each complex.</p><p>2 4. Explain the electronic spectrum of an aqueous solution of K3[TiF6] . Predict the magnetic moment (spin only) of the complex.</p><p>5. Sketch the partial qualitative molecular orbital diagram for metal-ligand π-bonding in octahedral complexes with: (a) π-donor ligands and (b) π-acceptor ligands.</p><p>3 Part III. (30 pts) Bonding:</p><p>8 2- 2+ 2- 1. (18 pts) The d complexes [NiCl4] and [Ni(en)3] are paramagnetic, whereas [Ni(CN)4] is diamagnetic. Explain these data based on the d orbitals splitting (CFT) diagrams.</p><p>2- 2+ 2- [NiCl4] [Ni(en)3] [Ni(CN)4]</p><p>2. (12 pts) What is the hybridization of the central nickel atom in each of the above complexes.</p><p>4 CHEM 451- Spring-2003 EXAM II </p><p>You will have 55 minutes to complete this exam. The exam has 4 pages plus Periodic Table When you are told to do so, tear off the Periodic Table cover sheet and use as required during exam.</p><p>1 2 1 H Periodic Table of the Elements He 1.01 4.00 3 4 5 6 7 8 9 10 2 Li Be B C N O F Ne 6.94 9.01 10.81 12.01 14.01 16.00 19.00 20.18 11 12 13 14 15 16 17 18 3 Na Mg Al Si P S Cl Ar 22.99 24.30 26.98 28.08 30.97 32.06 35.45 39.95 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.1 40.08 44.96 47.88 50.94 52.00 54.94 55.85 58.93 58.69 63.55 65.38 69.72 72.59 74.92 78.96 79.90 83.80 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.47 87.62 88.91 91.22 92.91 95.94 (98) 101.1 102.9 106.4 107.9 112.4 114.8 118.7 121.8 127.6 126.9 131.1 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 6 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.9 137.3 138.9 178.5 181.0 183.8 186.2 190.2 192.2 195.1 197.0 200.6 204.4 207.2 209.0 (209) (210) (222) 87 88 89 104 105 106 107 108 109 110 111 112 7 Fr Ra Ac Rf Db Sg Bh Hs Mt Uun Uuu Uub (269) (272) (277) (223) 226.0 227.0 (261) (262) (263) (262) (265) (266)</p><p>58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.1 140.9 144.2 (145) 150.4 152.0 157.2 158.9 162.5 164.9 167.3 168.9 173.0 175.0 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.0 231.0 238.0 237.0 (244) (243) (247) (247) (251) (252) (257) (258) (259) (260)</p><p>5 6</p>