8. A solution contains 0.10 M HA (if ) and 0.10 M NaA. Calculate the pH of this solution.
(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

9. For the gas reaction of NX₃ with HBr, if X with average molecule weight of 29 and reaction figure shown below. If no air were present in the reaction tube, what will be the ratio (r) of NX₃: HBr gas traveling distances to form the white ring of (. (A) 0.75-0.85 (B) 0.85-0.95 (C) 0.95-1.05 (D) 1.05-1.15 (E) ＞1.15

10. If H₃A is a triprotic acid with . What the pH of a 1.0 M solution of NaH₂A. (A) ＜5 (B) 5-6 (C) 6-7 (D) 7-8 (E) ＞8

11. Calculate the pH of a 0.10 solution. If the value for M is 1 x. (M is a compound). (A) ＜5 (B) 5-6 (C) 6-7 (D) 7-8 (E) ＞8

12. For the synthesis of ammonia at 500°C, the equilibrium constant is 6.0 x L²/mol². Predict the direction in which the system will shift to reach equilibrium in the following case. (A) The ammonia synthesis reaction will go backward. (B) The ammonia synthesis reaction will go forward. (C) The ammonia synthesis reaction is under equilibrium. (D) The ammonia synthesis reaction is under equilibrium and will stop reaction. (E) The ammonia synthesis reaction will not work.

13. At 25°C, the following heats of reaction are known:  What is the ΔH (kJ/mol) for the following reaction at the same temperature? CIF + F₂ → CIF₃ (A) -217.5 (B) -108.7 (C) +217.5 (D) -130.2 (E) none of these

14. For a second order reaction: aA → products. Which equation is true? (k is rate constant and is the initial concentration ofA) (A) (B)(C) (D) (E)

15. For a certain reaction with rate constant of k₁ at temperature T₁ and rate constant of k₂ at temperature T₂. Which equation is true for you to obtain the Ea (activation energy) of this reaction? (A) (B) (C) (D) (E) All the above four equations are wrong.

16. In which of the following changes is the work done by the system the largest at 25°C? (A) an isothermal reversible expansion of an ideal gas from 1 L to 10 L (B) an isothermal expansion of an ideal gas from 1 L to 10 L against an opposing pressure of 5 atm (C) an isothermal free expansion of an ideal gas from 1 L to 10 L (D) an isothermal expansion of an ideal gas from 1 L to 10 L against an opposing pressure of 1 atm (E) The work is the same for all these processes.

17. Which of the following is the strongest oxidizing agent? (A)  (B) I₂ (C) MnO₂ (D) Zn (E)

18. In which of the following cases must E be equal to zero? (A). II only (B). I and II (C). III (D). I only (E). None of them

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