15. What is the most likely structure of Compound N?
(A)
(B)
(C)
(D)

(E)

16. 18 electrons can generally be the most stable configuration for most organometallic compounds due to:(A) electrons filling in antibonding orbitals in the molecular orbitals(B) no electron filling in antibonding orbitals in the molecular orbitals(C) electrons filling in non-bonding orbitals in the molecular orbitals(D) no electrons filling in non-bonding orbitals in the molecular orbitals(E) None of the above

17. What is the point group of a water molecule?(A) C2v(B) C2(C) C3v(D) σd(E) None of the above

18. X-rays have a shorter wavelength than visible light?(A) True(B) NOT True(C) No such thing called X-ray(D) No such thing called visible light(E) None of the above

19. In a two-dimensional crystal lattice, which one of the following indices corresponds to the smallest density of lattice points?(A) (10)(B) (13)(C) (21)(D) (11)(E) (41)

20. AgCl has a higher solubility than AgI, can be most likely explained by:(A) dipole interaction(B) redox chemistry(C) Hard and Soft Acids and Bases(D) corrosion chemistry(E) None of the above

21. The first time you are going to operate an unfamiliar high-temperature tube furnace (or a high-pressure autoclave), what would you do?(甲) Just follow what senior lab members told me—after doing it once, I'll know how.(乙) Read the SOP/manual first and confirm the safety limits (temperature, heating/cooling rate, atmosphere, pressure).(丙) Perform a dummy run (blank run) to check that the temperature control and gas flow are functioning properly.(丁) Set all parameters to the maximum to test the limits.(戊) Verify ventilation, exhaust/effluent handling, emergency shutoff, and required personal protective equipment (PPE) in advance(A) 乙丙戊(B) 丙丁(C) 甲丁戊(D) 乙丁(E) 甲乙丙丁戊

22. For a low-spin d⁴ case, it is expected to show a stronger Jahn-Teller effect than that of high-spin one.(A) True(B) NOT True(C) the same(D) No such thing called Jahn-Teller effect(E) None of the above

23. Which of the following statements is correct?(A) The concepts of labile/inert are thermodynamic concepts(B) In octahedral complexes, weak field ligands in the spectrochemical series increase the Δo of the complexes.(C) A metal with six d electrons in an octahedral configuration will be diamagnetic if high-spin.(D) In the selection rules, transition between different spin multiplicities is forbidden(E) All of the above

24. What is the formal name for [Cu(NH3)4]SO4?(A) tetraamminecopper(II) sulfide(B) tetraamminecopper sulfide(C) fouramminecopper (II) sulfide(D) tetraamminecopper(II) sulfate(E) None of the above

25. Which of the following theory models can explain that there are two lone pairs in a water molecule?(A) Hard and Soft Acids and Bases(B) Lewis structure model(C) molecular orbital(D) Le Chatelier's principle(E) Ligand field theory

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