21. When 6 M sodium hydroxide is added to an unknown white solid, the solid is dissolved. What is a possible identity for this solid?
(A) Mg(OH)₂
(B) Al₂(SO₄)₃
(C) BaCO₃
(D) AgBr
(E) Ca₃(PO₄)₂ 

21. When 6 M sodium hydroxide is added to an unknown white solid, the solid is dissolved. What is a possible identity for this solid? (A) Mg(OH)2 (B) Al2(SO4)3 (C) BaCO3 (D) AgBr (E) Ca3(PO4)2

29. 中藥鉛丹常造成中毒事件，其主成分為 Pb3O4，此成分可由一氧化鉛於空氣中加熱至 500 ºC 製得， 然而產物中常殘留一氧化鉛，可用何種溶液來純化？ (A) Na2CO3 (B) KOH (C) HCl (D) H2SO4

22. 在相同溫度下，氯化銀(AgCl)在水中的溶解度是 A，在強酸溶液中的溶解度是 B，在高濃度的氨(NH3)溶液中溶解度 是 C。下列何者正確？ (A) C ＞ A ＞ B (B) C ＞ B ＞ A (C) C ＞ A ≈ B (D) A ≈ B ≈ C

22. A chemist wishes to separate benzoic acid from 4-hydroxybenzaldehyde. Which is the best method to achieve this separation? (A) Partitioning the mixture between diethyl ether and water. (B) Partitioning the mixture between diethyl ether and 1 M aqueous NaHCO3. (C) Partitioning the mixture between diethyl ether and 1 M aqueous NaOH. (D) Partitioning the mixture between diethyl ether and 1 M aqueous HCl. (E) Recrystallizing the mixture in diethyl ether.

23. The reaction system has already reached equilibrium. Which of the following statements is correct? (A) Additional H2O(g) added to the system will shift to the left to obtain the equilibrium. (B) As an exothermic reaction, the system will shift to the right to attain the equilibrium when temperature increases. (C) When carbon dioxide is removed, the system will shift to the left to achieve the equilibrium. (D) When volume of the reaction container is decreased, the system will shift to the right to reach the equilibrium. (E) Addition of helium gas into the reaction system will have no effects on its equilibrium.

24. Which elements are most similar in atomic size? (A) Li (Z = 3) and Na (Z = 11) (B) B (Z = 5) and Al (Z = 13) (C) Co (Z = 27) and Rh (Z = 45) (D) Zr (Z = 40) and Hf (Z = 72) (E) Be (Z = 4) and F (Z = 9)

25. In the Lewis structure of I3 – , there are _________ electrons around the central iodine atom. (A) 4 (B) 6 (C) 8 (D) 10 (E) 12

26. Which of the following statements is incorrect for colloids? (A) Colloids are suspension of very large particles ( ＞2000 nm) in a medium. (B) Tyndall effect is observed for colloids. (C) Electric repulsion seems to be the main factor that stabilizes colloids. (D) Removal of soot from smoke is an example of coagulation of colloids. (E) None of the above.

27. Which organic base is NOT found in RNA? (A) Uracil (B) Cytosine (C) Thymine (D) Adenine (E) Guanine

28. The figure below is a cross section of the electron probability distribution for an orbital. What are n and l values for this orbital? (A) n = 3, = 1 (B) n = 2,= 0 (C) n = 2, = 1 (D) n = 3, l = 2 (E) n = 2, = 2

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