11 In a face-centered cubic lattice of a metal, each atom is surrounded by how many nearest neighbors (atoms in contact)?

(A)4

(B)6

(C)8

(D)10

(E)12

12 Given that the molar heats of sublimation and fusion of iodine are 62.3 kJ/mol and 15.3 kJ/mol, respectively, calculate the molar heat of vaporization of liquid iodine.(A)77.6 kJ/mol(B)47.0 kJ/mol(C)-47.0 kJ/mol(D)-77.6 kJ/mol(E)7.76 kJ/mol

13 Which of the following statements is false according to Raoult's law?(A)The vapor pressure of a solvent over a solution decreases as its mole fraction increases.(B)The solubility of a gas increases as the temperature decreases.(C)The vapor pressure of a solvent over a solution is less than that of pure solvent.(D)The greater the pressure of a gas over a solution the greater its solubility.(E)Ionic solutes dissociate in solution causing an enhancement of all colligative properties.

14 Among these 0.10 M solutions, which one will have the lowest pH?(A)HCN(B)HNO₃(C)NaCl(D)H₂CO₃(E)NaOH

15 Arrange the acids HOCl, HClO₃, and HClO₂ in order of increasing acidity.(A)HOCl＜HClO₃＜HClO₂(B)HOCl＜HClO₂＜HClO₃(C)HClO₂＜HOCl＜HClO₃(D)HClO₃＜HOCl＜HClO₂(E)HClO₃＜HClO₂＜HOCl

16 At constant T and P, a negative sign for ΔG indicates that(A)the reaction is exothermic.(B)the reaction is endothermic.(C)the reaction is fast.(D)the reaction is spontaneous.(E)ΔS must be＞0.

17 For the reaction H₂(g)+S(s)→H₂S(g), ΔH°=-20.2 kJ/mol and ΔS°=+43.1 J/K·mol. Which of these statements is true?(A)The reaction is only spontaneous at low temperatures.(B)The reaction is spontaneous at all temperatures.(C)ΔG° becomes less favorable as temperature increases.(D)The reaction is spontaneous only at high temperatures.(E)The reaction is at equilibrium at 25°C under standard conditions.

18 In the complex ion [Cr(C₂O₄)₂(H₂O)₂]⁻, the oxidation number of Cr is(A)+1(B)+2(C)+3(D)+4(E)+5

19 How many unpaired electrons are there in the complex ion [Mn(CN)₆]³⁻?(A)0(B)1(C)2(D)3(E)4

20 Which of the following species are radicals?(A)CH₂O(B)HCN(C)HClO(D)ClONO₂(E)ClO

21 Which of the compounds listed below has the weakest hydrogen bonds?(A)CH₄(B)H₂O(C)SiH₄(D)HF(E)H₂S

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