1. Which noble gas is used in airport runway and approach lights? • He • Ne • Ar • Kr • Xe

2. Which of the following statements about noble gases is incorrect? • Except for radon, they can be isolated by fractional distillation of air. • Radon can be collected from the radioactive disintegration of radium salts. • Helium is produced from some natural gas fields. • The only forces of attraction among noble gas atoms are dipole-dipole attractions. • The attractive forces of He are so small that it cannot be solidified at 1 atm.

3. Which one of the following compounds (apparently) involves sp3d2 hybridization at the xenon atom? • XeO3 • XeF2 • XeF4 • XeF6 • XeO4

4. 1. 2. 3. 4. 5. Which of the following equations does not represent a correct reaction? • 2Fe + 3F2 {image} 2FeF3 • Cu + Cl2 {image} CuCl2 • Fe + I2 {image} FeI2 • 2Fe3+ + 2I- {image} 2Fe2+ + I2 • Cu + I2 {image} CuI2

5. Write and balance the formula unit equation for the reaction of iron with fluorine. The sum of the coefficients in the balanced equation (include one's) is _____. • 6 • 7 • 3 • 4 • 5

6. Write and balance the formula unit equation for the reaction of iron with iodine. The sum of the coefficients in the balanced equation (include one's) is _____. • 6 • 7 • 3 • 4 • 5

7. The anhydride of perchloric acid is _____. • ClO2 • Cl2O7 • Cl2O3 • ClO3 • Cl2O5

8. Which formula is incorrect? • SF4 • SF6 • SO2 • SO3 • SCl3

9. Calculate the mass of KClO3 that would be required to produce 29.52 liters of oxygen measured at 127°C and 760. torr. 2KClO3 {image} 2KCl + 3O2 • 7.82 g • 12.2 g • 14.6 g • 24.4 g • 73.5 g

10. Write and balance the formula unit equation for the reaction of sulfur with potassium. Represent sulfur as S rather than S8. The sum of the coefficients in the balanced equation (include one's) is _____. • six • seven • three • four • five

11. Which acid listed on the right cannot be obtained by adding water to the substance on the left? • SO3 sulfuric acid • TeO2 telluric acid • H2S2O7 sulfuric acid • SO2 sulfurous acid • SeO2 selenous acid

12. Write the molecular equation for the thermal decomposition of ammonium nitrate at 170° to 260°C to produce dinitrogen oxide and steam. What is the sum of the coefficients? • 4 • 5 • 6 • 8 • 9

13. Write the equation for the reaction of gaseous ammonia with oxygen in the presence of red-hot platinum. (This is the first step of the Ostwald process.) What is the sum of the coefficients? • 17 • 18 • 19 • 20 • 21

14. Superphosphate of lime is produced by the reaction of phosphate rock with _____. • Na2CO3 • HCl • H2SO4 • CaCO3 • Ca(HCO2)3