9 Which of the following molecules possesses tetrahedral geometry?

(A)XeF₄

(B)BF₃

(C)AsF₅

(D)CF₄

(E)NH₃

10 How many atoms are present in a body-centered cubic unit cell?(A)1(B)2(C)3(D)4(E)8

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

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