10. Within the principle of hard and soft acids and bases (HSAB), which pair of metal ion and donor atom is BEST matched?
(A) Al³⁺ and O
(B) Ag⁺ and O
(C) Li⁺ and S
(D) Ca²⁺ and S

11. When [EDTA]4- coordinates to a metal ion, M2+, to give [M(EDTA)]2-, the number of chelate rings formed is: (A)4 (B)5 (C)6 (D)3

12. A potential (Latimer) diagram shows the following data:What is the value of x? (A)-0.44 (B)-0.81 (C)-0.40 (D)+0.73

13. The pKa of HNO2 is 3.37. The pH of a 0.01 mol dm-3 aqueous solution of HNO2 is: (A)5.37 (B)2.69 (C) 1.69 (D)0.69

14. In neutral aqueous solution,E°for the Mn3+/Mn2+ couple is +1.54 V. At pH 14,E°for the Mn(OH)3/Mn(OH)2 couple is t0.15 V. Which of the following statements is incorrect? (A) At pH 14, Mn(II) and Mn(III) both precipitate from aqueous solution as hydroxides (B) Mn(III) is less stable with respect to reduction to Mn(II) at pH 14 than at pH 7 (C) The Mn(OH)3/Mn(OH)2 couple refers to an equilibrium involving Mn(III) and Mn(II) (D) At pH 7, Mn3+(aq) is a relatively strong oxidizing agent

15. A superacid is a stronger acid than? (A) anhydrous HCI(B) anhydrous HClO4 (C) anhydrous H2SO4 (D) anhydrous HNO3

16. Which of the following behaves as a base in liquid HF? (A) HOSO3F (B) BF3 (C) PF5 (D) BrF3

17. How many stereoisomeric forms of each of square-planar [PtCl2(NH3)2] and tetrahedral [NiCl2(PPh3)2] are there (A)[PtCI2(NH3)2], two, [NiCl2(PPh3)2],two (B) [PtCl2(NH3)2], two；[NiCl2(PPh3)2],one (C) [PtCI2(NH3)2], one；[NiCl2(PPh3)2],one (D) [PtCI2(PPh3)2], one； [NiCl2(PPh3)2],two

18. Cis- and trans-isomers of square planar [PtCI2(PPh3)2] can be distinguished by several methods. Which statement is incorrect? (A) cis-[PtCI2(PPh3)2] has two IR active Pt-CI stretching modes but trans-[PtCl2(PPh3)2] has only one (B) In the 31P NMR spectrum, the observed J(31P31P) for trans-PtCl2(PPh3)2 is greater than that for cis- [PtCl2(PPh3)2] (C) The value of J1p195Pt) for cis-[PtCl2(PPh3)2] is greater than that for trans-(PtCl2(PPh3)2] (D) X-ray crystallography would definitively distinguish between the isomers

19. Which of the following correctly places the metal centres in their order in the spectrochemical series? (A) Pd(II) ＜Ni(Il) ＜Pt(IV) (B) Co(III) ＜Co(II)＜Rh(III) (C) Pt(IV) ＜Pd(II) ＜Ni(II) (D) Mn(II) ＜ Fe(III) ＜ Rh(III)

20. Which metal complex ion is expected to be subject to a Jahn-Teller distortion? (A)[Cr(OH2)6]3+(B)[Cr(NH3)6]2+(C)[Cr(CN)6]3-(D)[Cr(bpy)3]2+

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