12. How many of the following molecules or ions contain a C₃ axis and a plane?

(A) 4
(B) 3
(C) 2
(D) 1
(E) 0

8. Which of the following water solution is more acidic? (A) 1M HCl (B) 1M HNO₃ (C) 1M H₂SO₄ (D) 1M CH₃COOH (E) 1M NaOH

9. Regarding "ionic liquid", which of the following is   incorrect  ? (A) it is a green solvent beneficial to the environment (B) it is a kind of salt (C) its melting point is generally below room temperature (D) its structure has a significantly low symmetry (E) it is highly stable with negligible vapor pressure

10. 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 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

11. Which of the following statements is   correct  ? (A) The conductivity of metal raises with the increase of temperature (B) the addition of boron into the silicon forms the n-type semiconductor (C) the decrease of temperature enhances the conductivity of semiconductors (D) because both valence band and conduction band are full, the electrons can not move so that the insulator is not conductive (E) because all the valence electrons of carbon form the covalent bonds, the diamond is not conductive

13. What is the formal charge of oxygen in carbon monoxide? (A) +2 (B) +1 (C) 0 (D) -1 (E) -2

14. The following diagram summarizes the reduction potentials (εº) of different chromium species. Please calculate the ε from to Cr (Value of X). (A) -2.22 (B) -1.32 (C) -0.74 (D) -0.66 (E) -0.44

複選題15. There are two groups of solutions: group A includes the water solutions of 0.01M AgNO₃, 0.01M Pb(NO₃)₂, 0.01M Ba(NO₃)₂, and 0.01M Ni(NO₃)₂. Group B includes the water solution of 0.01M NaCl, 0.01M Na₂SO₄, and 0.01M Na₂S. If we take each solution in group A to mix with equal volume of each solution in group B, which of the following statements is   correct  ? (A) There are 8 solutions with precipitation (B) there are 5 solutions with no precipitation (C) there are 4 solutions with black precipitation (D) there are 5 solutions with white precipitation (E) none of the mixtures with Ni(NO₃)₂ has the precipitation

1.冰水流量開關應裝設在(A)冰水泵之出水處至冰水器之入口處(B)冰水器之出口端(C)只要在冰水管路中任何處皆可(D)冰水泵之入水端。

2.依據公共工程製圖標準圖例，如下圖符號表示：(A)自動切換開關(B)伏特計用切換開關(C)水流開關(D)安培計用切換開關。

3.電感值0.25亨利，頻率為50Hz，求其電抗(歐姆)？(A)15(B)94.3(C)78.5(D)12.5。