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

14. Fluoroantimonic acid is formed by reacting hydrogen fluoride with antimony pentafluoride. The resulting mixture is complex but can be simplified as shown in the equilibrium below. Choose the INCORRECT statement regarding this reaction. $$ \mathrm{SbF_5} + 2 \mathrm{HF} \rightleftharpoons \mathrm{SbF_6^-} + \mathrm{H_2F^+} $$ (A) HF acts as a Lewis base (B) HF acts as a Brønsted acid (C) HF acts as a Lewis acid (D) HF acts as a Brønsted base (E) $\mathrm{SbF_5}$ acts as a Lewis acid

15. Metformin is the first-line medication for treating type 2 diabetes. Its conjugate acid has a $\mathsf{pK}_{\mathsf{a}}$ of 12.4. Calculate the ratio of protonated Metformin to neutral Metformin in the bloodstream $(\mathsf{pH} \approx 7.4)$. (A) $10^{5}$ (B) $10^{3}$ (C) 10 (D) $10^{-3}$ (E) $10^{-5}$

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