27. Match the M-M bond orders to the species given. Which pair is incorrect?
(A) [Re₂Cl₈]^2-； Re-Re bond order = 4
(B) [W₂Cl₉]^3-； W-W bond order = 3
(C) [Mo₂Cl₈]^4- ； Mo-Mo bond order = 4
(D) [Os₂CI₈]^2-；Os-Os bond order = 4

1. Which pair of the molecule and point group is correct? (A) CH2Cl2, Td (B) CHC13, C3v (C) CCl4,D4d (D) CCl2Br2,C2h

2. An Oh XY6 molecule exhibits two Tru, IR active modes. Which statement is true? (A) Each Tiu mode is triply degenerate, and each gives rise to one absorption in the IR spectrum of XY6  (B) Each Tiu mode is triply degenerate, and each gives rise to three absorptions in the IR spectrum of XY6 (C) Each Tlu mode is non-degenerate, and gives rise to one absorption in the IR spectrum of XY6 (D) One of the Tiu modes is the symmetric stretching mode of XY6

3. Elemental analytical data for a new, monomeric compound X is a requirement of publishing details of the compound in the literature, even when crystallographic and spectroscopic data are available. This is because: (A) elemental analysis is a requirement purely for historical reasons (B) elemental analysis is the only method of confirming that the compound contains no solvate (C) elemental analysis confirms the composition of the bulk sample (D) elemental analysis confirms that the compound is a monomer and not a dimer or higher oligomer

4. You are trying to find out if a thiocyanate ligand, [NCS] -, is bonded to a metal ion through the N or S atom. Which technique would be MOST useful to you? (A) 13C NMR spectroscopy(B) mass spectrometry (C) UV-VIS spectroscopy (D) IR spectroscopy

5. Which statement is true about orbitals with  t2g  symmetry? (A) MOs with t2g symmetry are found for molecules belonging to the Id point group (B) Each MO in a tig set of orbitals is centrosymmetric (C) A set of t2g MOs consists of two degenerate orbitals (D) MOs with t2g symmetry are found for molecules belonging to the C2v point group

6. Which of the following does not contain a C3 axis? (A)POCl3 (B)[NH4]+ (C)[H3O]+(D) CIF3

7. In order to describe the bonding in some compounds, it is necessary to invoke 3-centre 2-electron interactions. In which one of the following are such interactions usually invoked? (A) (BeH2)n (B) Al2Cl6 (C) (BeCl2)n (D) Si2H

8. A unit cell of ReO3 consists of a cubic arrangement of Re atoms with O atoms centered along each edge of the cube. The coordination number of each Re atom is: (A)6 (B)3 (C)8 (D)2

9. Which statement is incorrect? (A) CaO crystallizes with the CsCI structure (B) Wurtzite and zinc blende are polymorphs of ZnS (C) β-Cristobalite is one crystalline form of SiO2 (D) CaTiO3 (perovskite) is an example of a double oxide

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

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