9. Order the following according to increasing rate of effusion:
(A) CH₄ ＜NO₂＜NO＜F₂＜CI₂
(B) CI₂＜F₂＜NO₂＜CH₄＜NO
(C)CI₂＜NO₂＜F₂ ＜NO＜CH₄
(D) CH₄ ＜NO＜F₂＜NO₂＜Cl₂
(E) F₂ ＜NO ＜CI₂ ＜NO₂＜CH₄

10. As water is heated, its pH decreases. This means that (A) [OH-] ＞[H+] (B) [H+]＞ [OH-] (C) the water is no longer neutral (D) two of these are correct. (E) none of these is correct.

11. A 100.0-mL sample of 0.2 M (CH3)3N is titrated with 0.2 M HCI. What is the pH at the equivalence point? (A) 5.4 (B)7.0 (C) 10.3 (D) 3.1 (E) 9.9

12. You have a solution of 0.10 M CI- and 0.10 M . You add 0.10 M silver nitrate dropwise into the solution. . Which of the following will precipitate first? (A) silver nitrate (B) silver chromate (C) cannot be determined from the information given (D) silver chloride (E) none of these

13. A 0.012-mol sample of Na:SO, is added to 400 mL of each of two solutions. One solution contains 1.5 x 103 M BaCh； the other contains for CaSO, = 6.1 x 10S. Which of the following statements is true? (A) both BaSO4, and CaSO4 would precipitate (B) not enough information is given to determine whether precipitation would occur (C) CaSO4 , would precipitate, but BaSO4, would not (D) BaSO4, would precipitate but  CaSO4  would not (E) neither BaSO4, nor  CaSO4 , would precipitate.

14. is_________for exothermic reactions and_________ for endothermic reactions. (A) favorable, unfavorable (B) favorable, favorable (C) unfavorable, favorable (D) unfavorable, unfavorable (E) cannot tell

15. For the reaction . Therefore, the reaction under standard conditions is (A) spontaneou us only at temperatures between 10 K and 800 K (B) spontaneous at temperatures greater than 800 K (C) spontaneous at all temperatures (D) nonspontaneous at all temperatures (E) spontaneous at temperatures less than 10 K

16. When a battery dies, which of the following is true? (A)△G° = 0 (B)△G = O (C) E°= O (D) Q= 1 (E) A and C

17. Which of the following statements is/are true of the electrolysis of brine? I: chlorine is produced at the anode of the cell during the electrolysis of brine；Il: under normal circumstances, sodium is produced at the cathode of the cell during the electrolysis of brine； III: hydrogen is produced at the cathode of the cell during the electrolysis of brine. (A) I only (B) II only (C) III only (D) I and II (E) I and Ill

18. How many f orbitals have the value n = 3? (A) 3(B) 1 (C)0(D) 5(E)7

19. How many unpaired electr rons does cobalt have in its ground state? (A) 7 (B) 27 (C) 5 (D)3 (E)1

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