6. Which of the metal ions in the following complex has a d³ electron configuration?
(A) [Ti(H₂O)₆]²⁺
(B) [Ni(NH₃)₆]³⁺
(C) [Cr(CN)₆]^3- 
(D) [Fe(CN)₆]^³- 
(E) [FeCl₆]^4-

7. How many of the following molecules or ions (NF3, NO3-, BrF3, I3-, PC13, ICl3) have trigonal pyramid structures? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

8. How many of the molecules or ions in Problem 7 have a hybridization of dsp³ on the central atom? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

9. Consider the titration of 100.0 mL of a 0.05 M solution of the hypothetical weak acid H3X (Ka1=1.0x10-3, Ka2=1.0x10-7, Ka3=1.0x10-12) with 0.100 М КОН. Calculate the pH of the solution after adding 25.0 mL KOH. (A) 2.2 (B) 2.8 (C) 3.0 (D) 3.9 (E) 4.5

10. Calculate the pH of the solution in Problem 9 after adding 50.0 mL (total) KOH. (A) 4.5 (B) 6.0 (C) 5.5 (D) 5.0 (E) 6.5

11. Calculate the bond energy of F2- (in kJ/mol) by using the following data: ionization energy ofF2-(290 kJ/mol), ionization energy of F-(327.8 kJ/mol), and bond energy of F2 (154 kJ/mol). (A) 77 (B) 86 (C) 98 (D) 107 (E) 116

12. Arrange the following species in order of the shortest to the longest N-O bond:(1)H2NOH, (2)N2O, (3)NO⁺, (4)NO2-, (5)NO3-.(A) 3, 2, 4, 5, 1 (B) 4, 2, 3, 5, 1 (C) 2, 3, 4, 1, 5 (D) 1, 5, 4, 2, 3 (E) 2, 3, 4, 5, 1

13. A certain substance, X, has a triple-point temperature of 20°C at a pressure of 2.0 atm. Which one of the following statements cannot possibly be true? (A) X can exist as a liquid above 20°C. (B) X can exist as a solid above 20°C. (C) Liquid X can exist as a stable phase at 25°C, 1 atm. (D) Both liquid and solid X have the same vapor pressure at 20°C. (E) All of these statements could be true.

14. The temperature at some planet is so high that the electronic ground state of the hydrogen atom is at n = 4. What's the ionization energy of the hydrogen atom at that planet if that in the Earth is equal to E? (A) E/4 (B) 4E (C) E/16 (D) 15E/16 (E) 16E

15. Arrange the elements C, N, and O in order of increasing ionization energy. (A) C, N, O (B) O, N, C (C) C, O, N (D) N, O, C (E) none of these

16. 1.0 mole monatomic ideal gas at 300 K and 10.0 atm is expanded adiabatically and reversibly to 1.0 atm. Calculate the final volume (in L). (A) 5.2 (B) 13.5 (C) 7.6 (D) 9.8 (E) 11.2

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