6. Which of the following statement is true?
(A) It is impossible to satisfy the octet rule in XeF₂.
(B) Because SF4 exists, OF₄ should also exist because O and S are in the same family.
(C) In O₃, one O-O bond is stronger than the other.
(D) All elements with n = 2 must obey octet rule.
(E) CO₃ ^2- keep switching among three resonance structures.

7. Order the following from shortest to longest bond: C2, B2, H2, N2 (A) H2, N2, C2, B2 (B) C2, N2, H2, B2 (C) N2, C2, B2, H2 (D) C2, B2, H2, N2 (E) none of these

8. Which orbitals below form bonding molecular orbitals? (A) I and III (B) I, III, and V (C) I, IV, and V (D) I, IV, V, and VI (E) I, III, V, and VI

9. How many of the following are predicted to be stable diatomic species according to the molecular orbital (MO) model? H2 +, H2, H2 - , H2 2- , N2 2- , O2 2- , F2 2- (A) 2 (B) 3 (C) 4 (D) 5 (E) 6

10. Which of the following observation is explained by molecular orbital (MO) theory? (A) H2 is stable but He2 is not. (B) NO+ is more stable than NO- . (C) N2 has a very high bond energy. (D) B2 and O2 are paramagnetic but C2, N2, and F2 are diamagnetic. (E) All of above.

11. An aqueous solution of silver nitrate is added to an aqueous solution of potassium chromate, and this reaction produces a solid. What is the formula for the solid? (A) AgCrO4 (B) KNO3 (C) K2NO3 (D) AgK (E) Ag2CrO4

12. When the following reaction is balanced in acidic solution, what is the coefficient of water?Zn(s) + NO3 –(aq) → Zn2+(aq) + NH4 +(aq) (A) 1 (B) 2 (C) 3 (D) 4 (E) none of these

13. Which of the following statements is(are) true? (A) In exothermic reactions, the reactants are lower in potential energy than the products. (B) The heat of reaction and change in enthalpy can always be used interchangeably. (C) Enthalpy is a state function. (D) A chemist takes the point of view of the surroundings when determining the sign for work or heat. (E) At least two of these statements are true.

14. When increase pure water temperature, which is wrong? (A) pH remains 7. (B) [H+] increases. (C) [H+] = [OH- ] (D) The solubility of NaCl increases. (E) The conductivity increases.

15. Which statement is true of a process in which 1 mol of a gas is expanded from state A to state B? (A) The final volume of the gas will depend on the path taken. (B) The amount of work done in the process must be the same, regardless of the path. (C) When the gas expands from state A to state B, the surroundings are doing work on the system. (D) The amount of heat released in the process will depend on the path taken. (E) It is not possible to have more than one path for a change of state.

16. Which is correct? (A) The pH of a strong acid solution is always lower than the pH of a weak acid solution. (B) The equilibrium constants must be the same at different conditions, including different volumes, pressures, and temperatures. (C) HF is dangerous because it is a strong acid. (D) HCN is safe because it is a weak acid. (E) 10-6 M hydrochloric acid is still considered as a strong acid.

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