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.

26. The number of possible pairs of enantiomers for the formula M(ABA)cde? ABA is a tridentate ligand and c, d, e are a monodentate ligand. (A)1 (B)2 (C)3 (D)4 (E) 5

27. The coordination number of Au in complex [(Et3P)AuTi(CO)6]- is 2. What is the geometry in Ti atom? (A) Octahedral (B) Capped trigonal prismatic (C) Capped octahedral (D) Pentagonal bipyramidal (E) Square pyramidal

28. Which one of the following complexes is pentagonal planar? (A)(B) (C) VO(acac)2 (D)(E) XeF5

29. The has a geometry of (A) Tricapped trigonal prism (B) Capped square antiprisn (C) Capped octaherdon (D) Trigonal dodechedron (E) None of above

30. Determine the exchanging energies for high spin d6 ions in an octahedral complex. (A) 1Ile (B) 2Ile (C) 3Ile (D) 4Ile (E) 5Ile

31. On the basis of VSEPR, which of the following point group is NOT correct? (A) XeOF2 is (B) XeOF4 is (C) XeO2F2 is (D) XeO3F2 is (E) All correct

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