84. Which isomers of C₄H₈ has the lowest absolute entropy at 25°C?
(A) 1-butene
(B) cis-2-butene
(C) trans-2-butene
(D) 2-methylpropene
(E) cyclobutane

84. Which isomers of C4H8 has the lowest absolute entropy at 25°C? (A) 1-butene (B) cis-2-butene (C) trans-2-butene (D) 2-methylpropene (E) cyclobutane

85. What are the factors influencing the infrared frequency of the CX vibration for CH3X? I. mass of X II. strength of the CX bond III. type of CX vibration (stretch or bend) (A) I (B) II (C) I and II (D) II and III (E) I, II, and III

86. The radioactive isotope 247Bk (Z = 97) decays by a series of α-particle and β-particle productions, taking 247Bk through many transformations to end up as 207Pb (Z = 82). In the complete decay series, how many α particles and β particles are produced, respectively? (A) 10, 8 (B) 10, 5 (C) 10, 2 (D) 8, 8 (E) 5, 8

87. Consider the galvanic cell shown below (the contents of each half-cell are written beneath each compartment). The standard reduction potentials are as follows: Which of the following statements about this cell is incorrect? (A) The value of E° for this cell is 1.82 V (B) Electrons flow from the Cr electrode to the Pt electrode. (C) Reduction occurs at the Cr electrode. (D) The cell is not at standard conditions. (E) The value of E for this cell at 25°C should larger than 1.82 V.

88. A galvanic cell consists of two half-reactions:What is the maximum work can be obtained from this cell at standard condition? (Faraday constant = 96500 C mol‒1 ) (A) 173.7 kJ (B) 347.4 kJ (C) 569.4 kJ (D) 113.9 kJ (E) None of the above.

89. Alkali metals (Group 1) are different with alkaline earth metals (Group 2). Which of the following statements is correct? (A) Alkali metals have larger ionic radii. (B) Alkali metals have higher melting points. (C) Alkali metals have greater first ionization energies. (D) Alkali metals have greater densities. (E) Alkali metals have greater electronegativity.

90. The partial pressure of CO2(g) is 0.22 atm and that of CO(g) is 0.44 atm in a mixture of the two gases at 25ºC. What is the mass fraction of CO2 in the mixture? (atomic weight: C = 12 g/mol, O = 16 g/mol) (A) 44% (B) 56% (C) 33.3% (D) 66.7% (E) 50%

1. 下列化合物中，何者的臨界溫度(critical temperature)最高？ (A) CBr4 (B) CCl4 (C) CH4 (D) H2

2. 在賈凡尼電池(galvanic cell)中，Al(s) ǀ Al3+(aq, 1.0 M) ǀǀ Cu2+(aq, 1.0 M) ǀ Cu(s)。下面何者會增加 電池的電位(cell potential)？ (A) 只有 I (B) 只有 II (C) 只有 III (D) 只有 I 和 III 

 3. 核磁共振光譜儀無法測量下列哪種原子核？(A)14N (B) 2 H (C) 32S (D) 31P

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