17. Which of the following classes of organic compounds gives effervescence with a NaHCO₃ solution?

(A) Aldehydes

(B) Alkanes

(C) Esters

(D) Carboxylic acids

(E) None of above

18. According to the Crystal Field Theory, when the valence d orbitals of the central metal ion of a coordination compound are split in energy in an octahedral ligand field, which orbitals are raised least in energy? (A) dxy and dx2-y2 (B)dxy, dxz and dyz (C)dxzand dyz (D)dxz,dyz and dz2 (E) dx2-y2 and dz2

19. According to the equations below, please calculate △H for the reaction: IF5 (g) → IF3 (g) + F2 (g).  (A)+1135J(B)-1135J(C)+355kJ(D)+35kJ(E)-35kJ

20. Which of the following reactions would have a positive △S? (A) Pb(NO3)2 (aq) + 2KI (aq) → Pbl2 (s) + 2KNO3(aq) (B)2H2O(g)→2H2(g)+O2(g) (C) H2O(g)→H2O(s) (D) NO (g)+O2(g)→NO2(g) (E) Ag+(aq) +CI-(aq) →AgCI(s)

21.The balanced half-reaction in which a dichromate ion is reduced to chromium metal is a__________ process. (A) two-electron (B) six-electron (C) three-electron (D) four-electron (E) twelve-electron

22. The molecules below are:   (A) constitutional isomers(B) enantiomers (C) diastereomers (D) identical (E) none of above

23. Which of the following is a correct description of "catalyst?" (A) It stabilizes the product. (B) It lowers the reaction enthalpy. (C) There is no reaction between the catalyst and the reactants. (D) It decreases the activation energy. (E) It diminishes the energy gap between the starting materials and the products.

24. What is the point group of sulfuric acid (with the highest possible symmetry)? (A)Td (B)C4 (C) D2d (D)C2v (E) Cs

25. Rank the following compounds from the most soluble to the least soluble in water.(A)1＞2＞3＞4(B)2＞4＞1＞3(C)2＞1＞4＞3(D)3＞4＞1＞2(E)4＞2＞1＞3

26. There are three types of cubic unit cells, including simple cubic (SC), face-centered cubic (FCC), and body-centered cubic (BCC). Which of the following statements is correct? (A) BCC has 4 atoms per unit cell. (B) FCC has the largest unit cell. (C) The coordination number of SC is 8. (D) FCC is alternatively called hexagonal close-packed structure. (E) In BCC, the atomic packing factor is 0.68.

27. How many aromatic hydrocarbons have the molecular formula of C8H10? (A)2 (B)3 (C)4 (D)5 (E)6

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