23. Calculate the total number of unpaired electrons in the following complex ions: [Zn(H₂O)₆]²⁺, [NiCN₄]^2- (square planar), [Co(NH₃)₆]³⁺ (strong field).
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

24. Calculate the total number of unpaired electrons in the following complex ions: [Zn(H2O)6]2+, [Ni(CN)4]2- (square planar), [Co(NH3)6]3+ (strong field). (A)0 (B)1 (C)2 (D)3 (E)4

24. According to the VSEPR model, the electron pairs around NH3 and those around CH4 are arranged (A) differently, because in each case there are a different number of atoms around the central atom. (B) differently, because in each case there are a different number of electron pairs around the central atom. (C) the same, because both nitrogen and carbon are in the second period. (D) the same, because in each case there are the same number of electron pairs around the central atom. (E) differently or the same, depending on the conditions leading to maximum repulsion.

25. For the reaction below, Kp = 1.16 at 700.°С. CaCO3(s) CaO(s) + CO2(g)If a 24.6-g sample of CaCO3 is put into a 14.2-L container and heated to 700.°C, what percent of the CaCO3 will react to reach equilibrium? (A) 36.9% (B) 83.9% (C) 20.6% (D) 100% (E) 67.0%

26. Calculate [H+] in a 0.40 M solution of NaH2PO4. (For H3PO4, Kal = 7.5 × 10-3, Ka2 = 6.2 × 10-8, Ka3 = 4.8 × 10-13) (A) 2.2 × 10-5 M (B) 1.6 × 10-4 M (C) 0.40 M (D) 2.5 × 10-4 M (E) 3.9 × 10-11 M

27. Silver acetate (AgC2H3O2) is a sparingly soluble salt with Ksp = 1.9 × 10-3. Consider a saturated solution in equilibrium with the solid salt. Compare the effects on the solubility of adding to the solution either the acid HNO3 or the base NH3. (A) Either substance would decrease the solubility. (B) NH3 would increase the solubility, but HNO3 would decrease it. (C) NH3 would increase the solubility, but HNO3 would have virtually no effect. (D) Either substance would increase the solubility. (E) NH3 would decrease the solubility, but HNO3 would increase it.

28. The reduction potentials for Au³+ and Ni2+ are as follows: Au3+ + 3e → Au  E° = +1.50 V Ni2+ + 2e- → Ni   E°=-0.23 V  Calculate AG° (at 25°C) for the reaction 2Au3+ + 3Ni→ 3Ni2+ + 2Au (A) -5.00 × 102 kJ (B) +5.00 × 102 kJ (C) -2140 kJ (D) +1.00 × 103 kJ (E) -1.00 × 103 kJ

29. Which statement is true of a process in which 1 mol of a gas is expanded from state A to state B? (A) When the gas expands from state A to state B, the surroundings are doing work on the system. (B) The amount of work done in the process must be the same, regardless of the path. (C) It is not possible to have more than one path for a change of state. (D) The final volume of the gas will depend on the path taken. (E) The amount of heat released in the process will depend on the path taken.

30. An ethyl group (CH3CH2¯) that is attached to a substituent that does not contain a hydrogen atom appears as what in a NMR spectrum? (A) a doublet and a triplet with relative intensities of 2 and 3, respectively (B) a doublet and a triplet with relative intensities of 3 and 2, respectively (C) a triplet and a quartet with relative intensities of 2 and 3, respectively (D) a triplet and a quartet with relative intensities of 3 and 2, respectively (E) none of these

31. Which base-pair is most stable in Watson-Crick DNA Structure? (Image of base pairs) (A)(B)(C)(D)(E)

32. The following is a(n) ____ disaccharide with a(n) ____ glycosidic bond. (Image of disaccharide) (A) α； β(1→4) (B) α； β(1→1) (C) β； α(1→4) (D) β； α(1→1) (E) β； β(1→4)

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