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.

17. Which is correct? (A) When the concentrations of the reactants and products of a given chemical reaction remain unchanged, the system is at chemical equilibrium. (B) There are infinite equilibrium positions at equilibrium. (C) For an endothermic reaction, the reaction will shift to right when decreasing temperature. (D) In exothermic reactions, the reactants have lower potential energy than the products. (E) An exothermic reaction usually occurs more quickly than an endothermic reaction.

18. For a reaction in a voltaic cell, both ΔH° and ΔS° are positive. Which of the following statements is true? (A) E°cell will increase with an increase in temperature. (B) E°cell will decrease with an increase in temperature. (C) E°cell will not change when the temperature increases. (D) ΔG° > 0 for all temperatures. (E) None of the above statements is true.

19. Which of the following is the best reducing agent? (A) Cl- (B) Cl2 (C) H2 (D) Mg (E) Mg2+

20. Which substance can be described as cations bonded together by mobile electrons? (A) S8(s) (B) Ag(s) (C) Kr(l) (D) HCl(l) (E) KCl(s)

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