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)

14. In a two dimensional 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

26. In a group meeting, you are asked a question that you do not know how to answer. What would you do?(A) Talk your way out through bad chemicals.(B) Be silent and wait until the meeting ends(C) Change the subject(D) Blame the instrument(E) Admit that you do not know, explain how you would verify it or what additional experiments you would do, and report back next time with a careful data analysis.

27. As a new graduate student, you are about to begin a research project. Which of the following practices should you follow to get started?(甲) Search and read the literature for one time(乙) Keep searching and reading the literature all the time(丙) The results and theory from the literature are always correct. I should not argue with them.(丁) Always questioning the results published in scientific papers and in the literature(戊) Before starting any experiment, form a logical expectation (hypothesis) for the outcome.(A) 甲丁(B) 乙丁戊(C) 乙丁(D) 丙戊(E) None of the above

28. If a reaction suddenly cannot be repeated under your operation, what is your first step?(A) Do other reactions or experiments, so my Professor will forget to ask me about it later(B) Report to my professor, and he/she will tell me what to do next.(C) Make a variable checklist (e.g., temperature, concentrations, solvent, reagent purity, atmosphere, stirring, equipment, and batch-to-batch differences), and then carefully check all the variables one after one until knowing what the problem is.(D) Increase the temperature first to see whether it improves.(E) None of the above

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