34. Which one of the following structures is considered as "'See-saw"?
(A)
(B) IOF₃
(C)
(D) XeO₂F₂
(E) All of above

35. Glycine has the structure NH2CH2COOH. It can lose a proton from the carboxyl group and form chelate rings bonded through both N and one the O atoms. How many possible isomers of tris(glycinato)cobalt(III)? (A)3 (B)4 (C)5 (D)6 (E)8

36. The d2 ions have been reported. Which of following statements is false? (A) Complex has the largest value of .(B) Complex has the shortest metal- oxygen distance. (C) The nuclear charge of iron is greatest in this isoelectronic series. (D) These are LMCT absorption. (E) All of above.

37. What is the ground term for low-spin d4 ions? Which one of the following is correct? (A) Its configuration is t2g4eg0. (B) Spin multiplicity is 3. (C) Highest possible value of is 5. (D) The ground term is 3H. (E) All of above.

38. Which one of the following complexes is high spin? (A) (B) (C) (D) (E) None of above

39. A wide variety of ligands can kinetically stabilize ions that would normally be potent oxidizing agents. Which of the following statements is NOT correct for an example of Co(III)- Co(Il) couple? (A) Co(IIIl) is kinetically stable when coordinated with any ligand other than water of fluoride. (B) The hydrated is a very strong oxidizing agent, reacting readily with water to form H2 and Co(II). (C) The oxidation of a Co(Il) complex to a Co(IIl) complex generally results in a change from the high-spin Co(II) to the low-spin Co(IIl) accompanied by a significant increase in LFSE with almost any ligand. (D) The case in ( C ) often contributes to the stability of many Co(IIl) complexes, rending many of them weaker oxidizing agents than expected. (E) None of above.

40. Which one of the following complexes is labile? (A) (B) (C) (D)(E)

41.Predict the numbers of C-O and C-N stretches in cis-. (A)2,3 (B)2,4(C)1,3 (D)2,1 (E) 2,2

42. The NO (nitrosy1) ligand shares many similarities with CO. Which of the following statements is NOT correct? (A) Like CO, it's a o donor and π acceptor and can serve as terminal or bridging ligand. (B) NO has two common coordination modes； linear and bent. (C) Linear NO is counted as a 2-electron donor, same as CO. (D) has been used as a vasodilator for the treatment of high blood pressure. (E) Cr(NO)4 is tetrahedral molecule.

43. All five complexes followed 18E rule. Which one has the largest ? (A) (B) (C) Cr(CO)6 (D) (E)

44. What is the bond order in complexes Cp2Mo2(CO)4? (A)1 (B)1.5 (C)2 (D) 2.5(E)3

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