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

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 

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

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

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

24. Cisplatin is a well-known anticancer drug with the chemical formula Pt(NH3)2CI2. Which of the following statements is true? (A) Both Raman and IR spectra of cisplatin show two bands in the Pt-CI stretching region. (B) Only the Raman spectrum of cisplatin shows two bands in the Pt-CI stretching region； the IR spectrum does not show any bands in the Pt-Cl stretching region. (C) Only the infrared spectrum of cisplatin shows two bands in the Pt-CI stretching region； the Raman spectrum does not show any bands in the Pt-Cl stretching region. (D) Both Raman and IR spectra of cisplatin do not show any bands in the Pt-CI stretching region. (E) None of the above.

25. Which of the following is a measure of the randomness of a system in thermodynamics? (A) Energy (B) Pressure (C) Heat transfer (D) Work done(E) Entropy