17. Which of the following is a cyclic organic compound with four nitrogen atoms?
(A) Tetrazine
(B) Diazine
(C) Triazine
(D) Benenze
(E) None of the above

13. In vacuum, an electromagnetic wave traveling along the x axis has an electric field and a magnetic field whose magnitudes depend on x and t asE(x,t)=E0sin(kx一ωt),B(x,t)=B0sin(kx-ωt+Φ), where E0 and B0 are the amplitudes of . Which fact below is correct? (A) (B)The directions of  and   are arbitrary once they are perpendicular to x. (C)Φ=π/2 (D) ωk =c (E)This is a linearly polarized wave.

14. Which statement regarding total internal retlection is not true? (A) It cannot occur when the incident light is in the medium of lower index of refraction. (B) Total internal reflection oceurs for rays with their incident angles greater a critical angle. (C) It explains the phenomenon that the water-to-air interface looks like a mirror when an observer is in water. (D) It is used in transmission through optical fibers. (E) The effect is used to realize polarizers.

15. Which of the following statements on a wave functionφ(x,t) in quantum mechanics is correct? (A) The probability of finding the particle in region (B) The wave function can be determined via a series of measurements. (C) Since it is not a function of velocity, it does not carry the information of momentum. (D) All of the above. (E) None of the above.

16. Which type of titration is used to determine the concentration of calcium ions in a sample? (A) Acidity Titration (B) Alkalinity Titration (C) Redox Titration (D) Complexometric Titration (E) Ionic Strength Titration 

18. Which of the following organic compounds with the sum formula CroH4 exhibits two singlets in the 'H NMR spectrum and three signals in the 3C NMR spectrum?(A)(B)(C)(D)(E) None of the above

19. What type of bonds hold the monomers in a typical polymer like PP together? (A) Ionic bonds (B) Hydrogen bonds (C) Covalent bonds (D) Hydrophobic interaction (E) Van der Waals interaction

20. Which of the following amino acids has a positively charged side chain under physiological conditions? (A) Alanine (B) Asparagine (C) Glutamine(D) Aspartate (E) Arginine

21. Determine the ligand field stabilization energy of [Rh(H2O)6]3+. (A)0△o (B) -0.4△o (C)-1.9△o (D) -2.0 △o (E) -2.4 △o

【已刪除】22. Determine the number of isomers for the [Co(NH3)2(H2O)2BrCl]+ complex. (A)3 (B)4 (C)5 (D) 6 (E) 7 

23. The reactionhas a reaction enthalpy of △H = 217 kJ mol-1, If the bond energy of a single phosphorus-phosphorus bond is 200 kJ mol-', how much is the bond energy of the bond? (A) 92 kJ mol-1(B) 192 kJ mol-1(C) 292 kJ mol-1(D) 392 kJ mol-1(E) 492 k)mol-1