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+

21. Scanning tunnelling microscopy (STM) could be used to reveal what features of a metal surface? (A) step-edges and adsorbed species (B) elemental composition of the surface (C) oxidation states of adsorbed atoms (D) oxidation states of bulk and surface metal atoms

22. For which of the following might you use a Hoveyda-Grubbs' second generation catalyst? (A)alkene metathesis (B) hydroformylation (C) alkene hydrogenation (D) ethene epoxidation

23. The reactions of [PtCI4]2- with NH3 (reaction I) and of [PtCl4]2- with [NO2]- followed by NH3 (reaction II) are ways of preparing: (A) I: trans-[PtCI2(NH3)2]； II: trans-[PtCl2(NH3)(NO2)]- (B) I: cis-[PtCl2(NH3)2]:II:trans-[PtCl2(NH3)(NO2)]- (C) I: cis-[PtCl2(NH3)2]； II: cis-[PtCl2(NH3)(NO2)]- (D) I: trans-(PtCl2(NH3)2]: II: cis-[PtCl2(NH3)(NO2)]-

24. The first step in the Eigen-Wilkins mechanism for ML6 undergoing Y for L substitution is: (A) loss of L (B) addition of Y (C) formation of a weakly bound encounter complex (D) formation of a 7-coordinate complex in the rate-determining step

25. Match the structure type to the stated compound. Which pair is incorrect? (A) CoF2； rutile structure type (B) TiO； rock salt structure type (C) ZnS； zinc blende structure type (D) FeF2； anti-fluorite structure type

26. Which of the following is a π-donor ligand? (A)Cl- (B)NH3 (C)CO (D)PF3

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