21. Specify the number of unpaired electrons in CoF₆ ^3– (F– ion is a weak field ligand).
(A) 0
(B) 1
(C) 2
(D) 4
(E) 5

14. Which of the following aberrations is related to the wavelength of light? (A) spherical aberration (B) chromatic aberration (C) coma (D) astigmatism (E) distortion

15. An ideal fluid flows through a horizontal pipe whose diameter varies along its length. Measurements would indicate that the sum of the kinetic energy per unit volume and pressure at different sections of the pipe would __________. (A) decrease as the pipe diameter increases (B) increase as the pipe diameter increases (C) increase as the pipe diameter decreases (D) decrease as the pipe diameter decreases (E) remain the same as the pipe diameter changes

16. A point in the wave function where the amplitude is zero defines__________ . (A) the node (B) the excited state (C) the amplitude of the wave function (D) the frequency of radiation (E) none of the above

17. For a heterogeneous catalyzed reaction, the reaction can be divided into four processes: I. Escape or desorption of the products.II. Reaction of the adsorbed reactants.III. Migration of the adsorbed reactants on the surface of the catalyst.IV. Adsorption and activation of the reactants.What is the correct order of the process? (A) I → II →  III →  IV (B) IV →  III →  II →  I (C) I →  IV →  II→  III (D) IV →  II→  III → I (E) III →  II →  I →  IV

複選題18. The band gap of the semiconductor aluminum phosphide (AlP) is 2.5 eV. What color of light is emitted by AlP diode? (1 eV = 1.6 × 10-19 J； Planck’s constant: 6.626 × 10-34 J·s = 4.136 × 10-15 eV·s) (A) red (B) orange (C) yellow (D) green (E) blue

19. Which radiation is applied in nuclear magnetic resonance (NMR) technique? (A) X-ray (B) ultraviolet (C) infrared (D) visible (E) radio wave

20. Which of the following reactions is a disproportionation reaction? (A) HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) (B) Cl2(aq) + 2I⁻(aq) → I2(aq) + 2Cl⁻(aq) (C) CaSiO3(s) + 8HF(aq) → H2SiF6(aq) + CaF2(aq) + 3H2O(l) (D) AgNO3(aq) + NaCl(aq) → AgCl(aq) + NaNO3(aq) (E) Cl2(aq) + 2NaOH(aq) → NaClO(aq) + NaCl(aq) + H2O(l)

22. The MnO4ˉ ion is often used to analyze the Fe2+ concentration in an aqueous solution, based on the reaction in acidic condition as follows: (MnO4ˉ + Fe2+ ―→ Fe3+ + Mn2+ ) A 50.00 mL sample of a solution containing Fe2+ requires 40.00 mL of a 0.025 M KMnO4 solution for complete reaction. What is the concentration of the Fe2+ in the original solution? (A) 1.0 × 10-1 M (B) 1.8 × 10-2 M (C) 4.5 × 10-3 M (D) 1.8 × 10-3 M (E) 9.1 × 10-4 M

23. What is the number of lone pairs of electrons in the NO2 – ion? (A) 4 (B) 5 (C) 6 (D) 7 (E) 8

24. If you add 0.10 M silver nitrate dropwise to a solution consisting of 0.10 M Cl– and 0.10 M CrO4 2–, the precipitates are obtained. Given the Ksp for Ag2CrO4 is 9.0 × 10–12 and that for AgCl is 1.6 × 10–10. Which of the followings will precipitate first? (A) silver chloride (B) silver chromate (C) silver nitrate (D) It cannot be determined by the information given. (E) silver metal

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