15. Which of the following molecules/ions can be a Lewis acid?
(A) Hexane
(B) Borane
(C) Dinitrogen
(D)
(E) Diethyl ether

16. Which of the following molecules is the strongest base in aqueous solution? (A) NH3 (B) NH2Me (C) NHMe2 (D) NMe3 (E) NH2Ph

17. Which of the following answers shows the correct order of solubility in water for lead compounds? (A) PbS ＞ PbI2 ＞ PbBr2 ＞ PbCl2 (B) PbI2 ＞ PbBr2 ＞ PbCl2 ＞ PbS (C) PbS ＞ PbCI2 ＞ PbBr2 ＞ PbI2 (D) PbCl2 ＞ PbBr2 ＞ PbI2 ＞ PbS (E) PbBr2 ＞ PbCl2 ＞ PbS ＞ PbI2

18. Which of the following unit cells belongs to D4h point group? (A) Body-centered tetragonal (B) Face-centered cubic (C) Diamond (D) CsCI (E) Nickel arsenide

19. Which of the following electron configurations is incorrect? (A) V: [Ar]4s23d3 (B) Cr: [Ar]4s23d4 (C) Mn: [Ar]4s23d5 (D) Ni: [Ar]4s23d8 (E) Zn: [Ar]4s23d10

20. In point group, x and y coordinates belong to which of the following representations? (A) A1 and A2(B) A2 and B1 (C) A1 and B1 (D) A2 and B2 (E) B1 and B2

21. Which of the following answers includes only hard acids? (A) (B) (C) (D) CO, (E) TI(CH3)3,

22. Which of the following descriptions for sulfur is incorrect? (A) The most stable form at room temperature is a-S8. (B) The viscosity of sulfur decreases as the temperature increases from 120℃ to 300℃ (C) Sulfur can form linear long chain structure. (D) SO3 can be absorbed easily by sulfuric acid. (E) Peroxodisulfate is a useful oxidizing agent.

23. Which of the following descriptions for xenon is incorrect? (A) Xe can be reduced by PtF6 to form XeF+. (B) Xenon can be a ligand for . (C) The number of lone pairs on Xe in XeF4 is 2. (D) XeF4 has a square planar geometry. (E) Xe-N and Xe-C bonds can be found in some compounds.

24. Which of the following descriptions for carbon is incorrect? (A) Potassium atoms can be intercalated between graphite layers to form a strong reducing agent. (B) The point group of Buckminsterfullerene is . (C) The crystal structure of calcium carbide, CaC2, resembles that of NaCl. (D) 5-Coordinatie carbon can be found in some alkyl metal compounds. (E) Graphyne is constructed by carbon atoms with only single and double bonds.

25. Please select the correct oxidation states for nitrogen in the following compounds: NH3OH+, NO, N2O4. (A)-2,+1,+4(B)-1,+1,+3 (C)-2,+2,+3 (D)-1,+2,+4 (E) None of above.

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