3 The oxidation number of S in K₂SO₄ is
(A)+6
(B)+4
(C)+2
(D)-2

(E)-4

4 What are the predicted products of the single replacement reaction between solid iron (Fe) and aqueous copper(II) sulfate?(A)Cu(s)+FeSO₄(aq)(B)Fe(s)+Cu(s)+SO₄(aq)(C)CuS(s)+Fe₂SO₄(aq)(D)FeCuSO₄(aq)(E)FeO(s)+CuSO₃(aq)

5 Calculate the density of SF₆ gas at a temperature of 27°C and a pressure of 0.500 atm, expressed in grams per liter (g/L).(A)3.38 g/L(B)2.24 g/L(C)2.96 g/L(D)22.4 g/L(E)33.8 g/L

6 Among these compounds, which one is most likely to exhibit covalent bonding?(A)Rb₂S(B)SrCl₂(C)CS₂(D)CaO(E)MgI₂

7 Among these pairs of atoms, which one would likely form the most polar bond?(A)B-C(B)C-N(C)C-O(D)Si-O(E)C-C

8 Among these compounds, which one is most likely to exhibit ionic bonding?(A)NCl₃(B)BaCl₂(C)CO(D)SO₂(E)SF₄

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.

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