3. If the oxidation state of Rb in rubidium peroxide is c. The oxidation state of Cl in sodium hypochlorite is d. Question, what is the sum of c+d?
(A) 2
(B) 3
(C) 4
(D) 5
(E) 6

4. Potassium chromate is produced by the reaction of solid chromite ore $(\mathrm{FeCr_2O_4})$ with solid potassium carbonate and gaseous oxygen at high temperatures. The other products of the reaction are solid iron(III) oxide and gaseous carbon dioxide. In a particular experiment $169~\mathrm{kg}$ of chromite ore, $298~\mathrm{kg}$ of potassium carbonate, and $150~\mathrm{kg}$ of oxygen were sealed in a reaction vessel and reacted at a high temperature. a FeCr₂O₄ (s) + b K₂CO₃ (s) + c O₂ (g) → d K₂CrO₄ (s) + e Fe₂O₃ (s) + f CO₂ (g) Which compound is the limiting reagent? (A) O₂ (B) K₂CO₃ (C) K₂CrO₄ (D) Fe₂O₃ (E) FeCr₂O₄

5. Continue from question 4, what is the yield (kg) of potassium chromate, if 100%? (A) 283 (B) 293 (C) 303 (D) 313 (E) 323 

6. A 0.3 mole HA aqueous solution (1L; if HA with $K_{\mathrm{a}} = 1 \times 10^{-6}$) was added 0.15 mole NaOH, what is the pH of this solution? (A) 7 (B) 6 (C) 5 (D) 4 (E) 3

7. Balance the following oxidation-reduction reaction, which occurs in basic solution. $$ 1 \mathrm{P}_{4} + \mathrm{a H}_{2} \mathrm{O} + \mathrm{b OH}^{-} \rightarrow \mathrm{c HPO}_{3}^{2-} + \mathrm{d PH}_{3} $$ Question, what is the total number of        a + b     ? (A) 3 (B) 4 (C) 5 (D) 6 (E) 7

8. A 1.0 M HA (weak acid) solution was added some NaA (sodium salt of HA), how does the pH of this new HA solution change? (A) Unchanged (B) Become larger (C) Become smaller (D) Maintain at pH=7 (E) Cannot decide

9. For a yellow-orange gas X, which will partially undergo trimerization to give a colorless gas $(X_{3})$ at $25^{\circ}C$. 3 X (yellow gas) → X₃ (colorless gas)  If it was found that as the reaction temperature increases, the color of the two gaseous mixtures is getting darker. Which statement is correct? (A) The trimerization reaction is an endothermic and also exothermic reaction. (B) Cannot determine it is endothermic reaction or exothermic reaction. (C) The trimerization reaction is an exothermic reaction. (D) The trimerization reaction is an endothermic reaction. (E) All is correct.

10. What is the best structure for $\mathrm{C{12}H{14}O_3}$ which with the following NMR data? $^{1}\mathrm{H}$ NMR: $\delta 7.3$ (2 H, d, $J = 7\mathrm{Hz}$), 6.9 (2 H, d, $J = 7\mathrm{Hz}), 6.5 (1 H, dd, $J = 15 & 3 Hz), 6.2 (1 H, dd, J = 15 & 10 Hz), 5.7 (1 H, dd, $J = 10 & 3 Hz), 4.7 (1 H, septet, $J = 7\mathrm{Hz}$), 1.3 (6 H, d, J = 7\mathrm{Hz}$). $^{13}\mathrm{C}$ NMR also attached, as shown below. (A) (B) (C)(D) (E) 

11. Which metal is most likely the active center for catalyzing hydroxylation? (A) Fe (B) Mg (C) Zn (D) Al (E) Ca

12. Which n-nitrosamine is likely more carcinogenic? (A)(B)(C)(D)(E)

13. Choose the property of a reaction that a catalyst CANNOT affect. (A) rate constant (B) elementary steps (C) reaction order (D) Gibbs free energy difference between reactant and product (E) intermediates

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