2. When a solution of 0.1 M Na₂CO₃/0.1 M NaHCO₃ (H₂CO₃: K_a1 = 4.2 x I0-7 and Ka₂ = 4.69 x I0^-11) is titrated with 0.1 M HCl. Which one is the titration curve?
(A)
(B)
(C)
(D)
(E)

35. Based on the molecular orbital diagram shown below, which one is the most stable species? (A) NO2- (B)NO- (C)NO (D)NO+ (E) NO2+

36. Give the ground state electron configuration for Se2-. (A) [Ar]4s24p6 (B) [Ar]4s23d104p2 (C) [Ar]4s23d84p6 (D) [Ar]4s23d104p6 (E) [Ar]4s23d104p4

37. Displayed below is a step in the catalytic cycle of the Suzuki reaction, with 'L' representing a ligand. Which term from the provided options best describes this step?(A) Oxidative addition (B) Reductive elimination (C) Transmetallation (D) Nucleophilic substitution (E) None of the above

38. Which carbon atom is referred to as the anomeric carbon? (A)l (B)2 (C)3 (D)4 (E)5

39. Which complex ion, assuming M is the metal ion and X and Y are ligands in an octahedral geometry, can display geometric isomerism? (A) [MX6]2+ (B) [MX5Y]2+ (C) [MX4Y2]2+ (D) [MX3Y3]2+ (E) None of the above

40. A solution is prepared by mixing 2.0 M H3A and 2.0 M NaH2A in the equal volume (H3A: pXa1 = 2.10, pXa2 = 7.20, pXa3 = 12.30). Which one is the closest to the pH value of this mixture? (A) 2.10 (B) 2.45 (C) 4.65 (D) 7.20 (E) 9.75

41. Please select the accurate statements regarding entropy. (I) After the mixing of two gases, AS is positive.(II) Entropy is a thermodynamic property associated with the level of disorder. (III) If the temperature of a gas decreases, AS is positive. (IV) Molecules in the gaseous state exhibit higher entropy compared to those in the liquid state. (A) Only I and III (B) Only I, II, III (C) Only I and II (D) Only I, II, IV (E) Only II and III

42. What is the pH of the 1.0 M Na2HAsO4 solution (H3ASO4: pXa1 = 2.24, pXa2 = 6.96, pXa3 = 11.50)? (A) 2.24 (B) 4.60 (C) 6.96 (D) 9.23 (E) 11.50

43. In the illustrated resonance form of ozone below, what is the formal charge on the central oxygen atom? (A)+2 (B)+1 (C)0 (D)-1(E)-2

44. Which statement accurately describes voltaic cells?(I) Electrons flow from the anode to the cathode. ( II ) Electrons flow form the more negatively charged electrode to the more positively charged electrode. (III) Electrons flow from higher potential energy to low potential energy. (A) Only I (B) Only I and II (C) Only I and III (D) Only II and III (E) I, II and III

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