所屬科目：研究所、轉學考(插大)◆普通化學
1.The energy equation for a particle in a cubic box of dimensions Lx = Ly = Lz is
\( E_{n_x, n_y, n_z} = \frac{h^2}{8mL^2} [n_x^2 + n_y^2 + n_z^2] \)
For a particle in a cubic box, how many degenerate energy levels have energy equal to 14 h2 /8 mL2 ? (A) 1 (B) 12 (C) 6 (D) 8 (E) 3
2.What value is the closest estimate of Zeff for a valence electron of the calcium atom? (A) 20 (B) 40 (C) 2 (D) 6 (E) 1
3.Which of the following bonds is the least polar? (A) H–N (B) H–C (C) H–O (D) H–F (E) All are the same.
4.Which of the following molecules has a dipole moment? (A) SF4 (B) CF4 (C) XeF4 (D) All of these have a dipole moment. (E) None of these has a dipole moment.
5. Choose the molecule with the strongest bond. (A) I2 (B) F2 (C) Br2 (D) Cl2
6. Using the following data reactions:
calculate the energy of an H–Cl bond. (A)518 KJ (B) 326 KJ (C) 856 KJ (D) 770 KJ (E) 428 KJ
7. What is the hybridization of the central I atom in the molecule ICl5? (A)sp (B)sp2 (C)dsp3 (D)sp3 (E) d2 sp3
8. Specify the hybridization of the nitrogen atom in each of the following, in order.
NO3 – N2 NO2 – (A)sp2 , sp, sp2 (B)sp3 , sp, sp (C)sp2 , sp, sp3 (D)sp3 , sp2 , sp3 (E) none of these
9. Which charge(s) of O2 would give a bond order of 2.5? (A) 2 (B) –2 (C) –1 (D) 1 (E) +3
10.The bond order in the NO molecule is (A) 3 (B) 2 (C) 2.5 (D) 1 (E) 1.5
11.Which metal ion has a d4 electron configuration? (A) Ti2+ (B) Mn2+ (C) Ni2+ (D) Fe3+ (E) Mn3+
12.The spectrochemical series is
I – < Br– < Cl– < F– < OH– < H2O < NH3 < en < NO2 – < CN–
Which of the following complexes will absorb visible radiation of the highest energy (shortest wavelength)? (A)[Co(OH)6] 3– (B)[Co(NH3)6] 3+ (C)[Co(I)6] 3– (D)[Co(H2O)6] 3+ (E)[Co(en)3] 3+
13. How many unpaired electrons are found in NiBr4 2– (tetrahedral)? (A) 0 (B) 4 (C) 1 (D) 5 (E) 2
14. Which of the following chemical or physical changes is an endothermic process? (A) the freezing of water (B) the mixing of sulfuric acid and water (C) the evaporation of water (D) the combustion of gasoline (E) none of these
15. A salt solution sits in an open beaker. Assuming constant temperature and pressure, the vapor pressure of the solution . (A) decreases over time (B) We need to know which salt is in the solution to answer this (C) We need to know the temperature and pressure to answer this (D) stays the same over time (E) increases over time
16. A cucumber is placed in a concentrated salt solution. What is most likely to happen? (A) Salt will flow into the cucumber. (B) Salt will precipitate out. (C) Water will flow from the cucumber to the solution. (D) Water will flow from the solution to the cucumber. (E) No change will occur.
17. The destruction of a colloid is called . (A) coagulation (B) degeneration (C) denaturation (D) reconfiguration (E) none of these
18. The phrase "a solid dissolved in a gas" describes a(n) . (A) sol (B) aerosol (C) foam (D) emulsion (E) none of these
19. Which of the following exhibits the greatest metallic character? (A) Cs (B) K (C) Be (D) H (E) Al
20. Giving that MnO4 - + 4H+ + 3e- → MnO2 + 2H2O ε° = 1.68V, and MnO2 + 4H+ + 2e- → Mn2+ + 2H2O ε° = 1.21V, what is the standard potential for MnO4 - + 8H+ + 5e- → Mn2+ + 4H2O? (A) 2.89V (B) 0.47V (C) 2.62V (D) 1.49V (E) none of these
21. Which of the following molecules has the strongest intermolecular forces? (A) H2O(s) (B) CaF2 (s) (C) CO 2 (s) (D) LiF(s) (E) S8(s)
22. Which of the solubility of the following molecules will decrease as temperature rises? (A) sugar (B) KNO3 (C) KBr (D) CO2(g) (E) salt
23. Which of the following the systems shows negative change in entropy? (A) putting cream in your coffee (B) salt dissolve in water (C) a few drops of dye add in a clear water (D) iron rust (E) none of these
24. Which of the following molecules has the highest boiling point? (A) HF (B) CH4 (C) NH3 (D) PH3 (E) H2O
25. In an adiabatic system, 480 Joule of work was done by 1.0 mole of an ideal gas, what is the temperature change for the system? (R = ~ 8.0 J/K) (A) 60 (B) 0 (C) 24 (D) 40 (E) none of these
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