4. Balance the following oxidation-reduction reactions, which occur in basic solution. . What is a+b+c+d?
(A) ＜10
(B) 10
(C) 11
(D) 12
(E) 13

5. After some NaF was added into a 1.0 M HF solution, how does the pH of this HF solution change? (A) larger (B) smaller (C) unchanged (D) not related

6. The product is colorless in the dimerization of yellow X gas at 25 °C. If it was found that as the reaction temperature increase, the color of the mixture is getting darker. Is this dimerization reaction an endothermic or exothermic (or not determined) reaction? (A) not related (B) endothermic (C) exothermic (D) not determined

7. At 25°C and 1 atm, 100 g NaN₃ was inflated, calculate the volume (liters) of the N₂ gas released from it. (A) 10-30 (B) 30-70 (C) 70-110 (D) 110-140 (E) ＞140

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)

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