72. How many effective atoms are there in a body-centered cubic unit cell?
(A) 1/2
(B) 1
(C) 2
(D) 3/2
(E) 3

22. 具有面心立方晶格的 NaCl，每一單位格子中的總離子數有幾個？ (A) 2 (B) 4 (C) 8 (D) 16

27. CdS can be described as cubic closest packed anions with the cations in tetrahedral holes. What fraction of the tetrahedral holes is occupied by the cations? (A) 0.125 (B) 0.25 (C) 0.50 (D) 0.75 (E) 1.0

81. Which of the following statements concerning a face-centered cubic unit cell and the corresponding lattice, made up of identical atoms, is incorrect? (A) The coordination number of the atoms in the lattice is 8. (B) The packing in this lattice is more efficient than for a body-centered cubic system. (C) If the atoms have radius r, then the length of the cube edge is (D) There are four atoms per unit cell in this type of packing. (E) The packing efficiency in this lattice and hexagonal close packing are the same.

8. 具有面心立方晶格的 NaCl，每一單位格子中的總離子數有幾個？ (A) 2 (B) 4 (C) 8 (D) 16

38. 下列關於固態銅(solid Cu，面心立方單位晶格)的敘述，何者不正確？ (A) 具導電性 (B) 每單位晶格有 2 個原子 (C) 每個銅原子周圍有 12 個原子 (D) 面對角線的長度是銅原子半徑的 4 倍

73. Which of the following has a zero dipole moment? (A) NH3 (B) HCN (C) PCl5 (D) SO2 (E) H2O

74. An electron is promoted from the π to the π∗ molecular orbital in an O2 molecule following the absorption of a photon. Compared to the bond length in the non-excited molecule, the O2 bond length will . (A) be shorter (B) be longer (C) not be affected (D) be same (E) None of the above.

75. Determine the percent dissociation of a 0.18 M solution of hypochlorous acid, HClO. The Ka for the acid is 3.5 × 10−8 . (A) 4.4 × 10−2 % (B) 3.5 × 10−6 % (C) 6.3 × 10−9 % (D) 4.4 × 10−4 % (E) 7.9 × 10−3 %

76. The solubility of CaSO4 in pure water at 0 oC is 1.14 gram per liter. The value of the solubility product is . (A) 7.01 × 10–5 (B) 8.37 × 10–3 (C) 7.01 × 10–2 (D) 8.37 × 10–5 (E) None of the above.

77. It is desired to determine the concentration of arsenic in a lake sediment sample by means of neutron activation analysis. The nuclide As captures a neutron to form As , which in turn undergoes β decay. The daughter nuclide produces the characteristic γ rays used for the analysis. What is the daughter nuclide? (A) (B) (C) (D) (E)

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