19. The complex ion [Cr(CN)₆]^4- has magnetic properties that correspond to how many unpaired electrons?
(A)0.
(B)1.
(C)2,
(D) 3.
(E) 4.

20. Ethylenediaminetetraacetic acid (EDTA) is: (A) not useful as a chelating agent. (B) an effective antidote for heavy metal poisoning (e.g. Pb2- and Hg2- ). (C) a monodentate ligand. (D) known to form unstable complex ions with Fe3-. Hg2-, and Zn2-, (E) known to form complexes with platinums that inhibit the growth of cancerous cells.

21. Solutions of the complexes [Co(NH3)6]3- ( A ). [Co(H2O)6]3-( B ), and [CoCl4]4- ( C ) are colored. One is purple. another is yellow, and the third is blue. Which of the following combination is correct? A color wheel shown below is helpful in determining this relationship.(A) A : bule: B: yellow； C: purple  (B) A : yellow: B: blue: C: purple (C) A: purple； B: yeillow； C: blue Ccan (D) A: yellow； B: purple； C: blue (E) A : bule； B: purple: C: yellow 

22. The compound that can undergo oxidative addition reaction with Cla is: (A) [(η5-C5H5)2Fe],(B) [Mn(CO)5]- , (C) PtCl4, (D) [(η5-C5H5)Mo(CO)3]-, or (E) [Ir(CO)CI(PPh3)2].

23. What are the states (with J values) of 'D term? (A) 3D3,3D2,3D1. (B) 3D2,3D3,3D4. (C) 3P1, 3P2,3P3. (D)3P2, 3P3,3P4. (E) 3F2,3F3, 3F4.

24. Which of the following is labile? (A)[(η5-C5H5)2Ru],(B) [Mn(CN6)]3-,(C)[V(H2O)6]2+,(D)[CoF6]3-,or (E)[Pt(CN)4]2-

25. [Cu(H2O)6]2+has2D ground state term that splits into two energy levels, the state with lower energy is? (A) 2A1g,(B) 3T1, (C)3B1, (D) 2Eg, or (E) 2T2g

26. For the hexaaqua complexes of Mn(II), Fe(II), Co(Il), Ni(II), Cu(ll), and Zn(II), How many of them are expected to exhibit geometric distortions based on Jahn-Teller Theorem? (A) 0,(B) 1, (C) 2, (D) 3, or (E) 4.

27. The following statements are given regarding the complex [Ru(PPh3)3CI2] showing an agostic Ru-H-C interaction (structure shown on the right).I. This complex is an 1 8-electron species.ll. The 1H NMR shift of Ru-H-C shows in upfield region as compared to other protons.Ⅲ. The agostic C-H bonds shows vcH that shifts to lower wavenum ber as compared to other C-H bonds. IV. Increased acidity observed for the agostic C-H proton. How many of these statements are true:(A) 0, (B) 1, (C) 2, (D) 3, or (E) 4

複選題28. Exchange of an H2O ligand on [(CO)3Mn(H2O)3]+is much more rapid than on [(CO)3Re(H2O)3]+. The activation volume for the Mn case is -4.5 ± 0.4 cm3mol-1. The Mn complex has infrared bands at 2051and 1944 cm-1 that can be attributed to C-O stretching vibrations. Which of the following are correct? (A) First row transition metal complexes are generally more substitutionally labile, thus more "weak-field" than second and third row complexes. (B) The negative volume of activation is consistent with a D (or Id) mechanism. (C) Occurrence of two infrared bands of [(CO)3Mn(H2O)3]+ is more consistent with a fac isomer. (D) mer-[(CO)3Mn(H2O)3+ is isostructural with mer-[(CO)3Re(H2O)3]+. (E) The C-O stretching vibrations observed in [(CO)3Mn(H2O)3]+should have higher vibrational frequencies as compared to free CO.

複選題29. Two well-known complex ions containing Ni are [Ni(H2O)6]2+, which is green, and [Ni(en)3]2+ (en = ethylenediamine), which is purple. Which of these statements are true? (A) The green complex absorbs green light. (B) The reaction of [Ni(H2O)6]2+with excess of en should afford [Ni(en)3]2+. (C) Both complex ions are paramagnetic. (D) Both complex ions are 18-electron species. (E) The crystal field splitting energy is smaller for [Ni(en)3]2+ than for [Ni(H2O)6]2+

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