25. The molecule has a square pyramidal shape. Which of the following atoms could be X?
(A) O
(B) S
(C) P
(D) Xe
(E) At least two of these atoms could be X.

29. The molecule \( XCl_5^- \) has a square pyramidal shape. Which of the following atoms could be X? (A) S (B) Xe (C) O (D) P (E) At least two of these atoms could be X.

複選題26. Which ion is planar? (A) (B) (C) (D) (E)

複選題27. Which of the following statements is false? (A) The carbon-carbon bond in is shorter than the one in CH3CH3. (B) The carbon-carbon bond in is stronger than the one in CH3CH3. (C) C2 is diamagnetic. (D) C2 is paramagnetic. (E) Two of these statements are false.

複選題28. Which of the following statements is true? (A) All antibonding MOs are higher in energy than the atomic orbitals of which they are composed. (B) Electrons are never found in an antibonding MO. (C) Antibonding MOs have electron density mainly outside the space between the two nuclei. (D) None of these statements is true. (E) Two of these statements are true.

29. Of the following homonuclear diatomic molecules, which is paramagnetic? (A) C2 (B) B2 (C) F2 (D) N2 (E) None of the above

30. Shown below is a phase diagram for sulfur (not drawn to scale). Sulfur can exist in solid modifications, rhombic and monoclinic, denoted by , respectively. Which of the following statements is incorrect?  (A) At pressures close to 1 atm, rhombic sulfur can be in stable equilibrium with liquid sulfur. (B) Under ordinary atmospheric conditions (at sea level), sulfur does not sublime. (C) This system has two triple points. (D) At a given pressure, there is (at most) one temperature at which rhombic sulfur can exist in equilibrium with monoclinic sulfur. (E) None of these statements is incorrect.

31. A solution contains 1 mol of liquid A and 3 mol of liquid B. The vapor pressure of this solution is 314 torr at 25°C. At 25°C, the vapor pressure of liquid A is 265 torr and the vapor pressure of liquid B is 355 torr. Which of the following is true? (A) This solution exhibits a positive deviation from Raoult's law. (B) This solution is ideal. (C) This solution exhibits a negative deviation from Raoult's law. (D) None of these statements is incorrect.

32. Acetone (mw = 58.08, =232 mmHg) and butanone (mw = 72.11, =100 mmHg) have the indicated molar masses and vapor pressures. A container holds 1.00 kg of butanone. How much acetone must be added to the butanone to elevate the total vapor pressure over the mixture to 125 mmHg at 25°C? (A). 5.313 kg (B). 290 g (C). 188 g (D). More information needed (E). None of the above

33. Which of the following complexes shows geometric isomerism? (A). K[Co(H2O)2Cl4] (B). [Co(H2O)5Cl]Cl2 (C). [Co(H2O)5Cl]SO4 (D). Na3[CoCl6] (E). [Co(H2O)6]Cl3

34. In the Lewis acid-base model, acids are ______ and bases are ______ (A). donors, acceptors (B). donors, acceptors (C). electron pair donors, electron pair acceptors (D). donors, donors (E). electron pair acceptors, electron pair donors

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