18. In which of the following compounds does the bond between the central atom and fluorine have the greatest ionic character?
(A) OF₂
(B) SF₂
(C) SeF₂
(D) AsF₃
(E) SbF₃

19. Choose the molecule with the strongest bond. (A) F₂ (B) Cl₂ (C) Br₂ (D) I₂ (E) all the same

20. The bond order in the NO⁻ ion is (A) 1.0 (B) 1.5 (C) 3.0 (D) 2.0 (E) 2.5

21. Consider the molecular-orbital energy-level diagrams for O2 and NO. Which of the following is true? I: both molecules are paramagnetic； II: the bond strength of O2 is greater than the bond strength of NO； III: NO is an example of a homonuclear diatomic molecule； IV: the ionization energy of NO is smaller than the ionization energy of . (A) I only (B) I and II only (C) I and IV only (D) II and III only (E) I, II and IV

22. The fact that O2 is paramagnetic can be explained by (A) the Lewis structure of O2 (B) resonance (C) a violation of the octet rule (D) the molecular-orbital diagram for O2 (E) hybridization of atomic orbitals in O2

23. Which of the following statements is false? (A) C₂ is paramagnetic (B) C₂ is diamagnetic (C) the carbon-carbon bond in C₂²⁻ is stronger than the one in CH₃CH₃ (D) the carbon-carbon bond in C₂²⁻ is shorter than the one in CH₃CH₃ (E) two of these statements are false

24. Which of the following is the correct order of boiling points for NaNO₃, C₂H₅OH, C₂H₆, and Ne? (A) Ne ＜ C₂H₅OH ＜ C₂H₆ ＜ NaNO₃ (B) NaNO₃ ＜ C₂H₅OH ＜ C₂H₆ ＜ Ne (C) Ne ＜ C₂H₆ ＜ NaNO₃ ＜ C₂H₅OH (D) Ne ＜ C₂H₆ ＜ C₂H₅OH ＜ NaNO₃ (E) C₂H₆ ＜ Ne ＜ C₂H₅OH ＜ NaNO₃

25. The number of Pb atoms per unit cell is (A) 3 (B) 4 (C) 10 (D) 12 (E) 14

26. A certain metal fluoride crystallizes in such a way that the fluoride ions occupy simple cubic lattice sites, while the metal atoms occupy the body centers of half the cubes. What is the formula for the metal fluoride? (A) MF₂ (B) M₂F (C) MF (D) MF₈ (E) none of these

27. Which of the following statements is true about p-type silicon? (A) it is produced by doping Si with P or As (B) electrons are the mobile charge carriers (C) it does not conduct electricity as well as pure Si (D) all are true (E) none of these

28. Liquid A has vapor pressure x. Liquid B has vapor pressure y, and x ＞ y. What is the mole fraction of A in the liquid mixture if the vapor above the solution is 50% A? (A) y/(2x + 2y) (B) x/(2x + 2y) (C) x/(x + y) (D) y/(x + y) (E) none of these

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