Question 1

The VSEPR theory predicts molecular shapes for the noble gas compounds. Which of these is correct? I) XeF2 is linear.
II) XeOF2 is T-shaped.
III) XeF4 is square planar.

Accepted Answer

A)  I, II and III 
B)  I and II 
C)  I only 
D)  II only 
E)  III only

Question 2

Which of the following is found in Teflon, Freon-12, and in the acid commonly used to etch glass?

Accepted Answer

A)  carbon 
B)  chlorine 
C)  fluorine 
D)  hydrogen 
E)  oxygen

Question 3

The Frasch process for the production of elemental sulfur has been largely supplanted by a gas-phase process using the reduction of sulfur dioxide by:

Accepted Answer

A)  H2S(g) 
B)  H2O(g) 
C)  CS2(g) 
D)  H2SO4(g) 
E)  O3(g)

Question 4

Iodine is only very slightly soluble in water, but it dissolves readily in an aqueous solution of sodium iodide, because molecular iodine acts as:

Accepted Answer

A)  a Lewis base to form a coordinate covalent bond with Na+ ion 
B)  a reducing agent with water, to form the soluble I+ ion 
C)  an oxidizing agent with I- ion to form the soluble I3+ ion 
D)  a Lewis acid to form a coordinate covalent bond with I- ion 
E)  a catalyst for the disproportionation of water

Question 5

The most reactive of the nonmetallic elements is ________.

Accepted Answer

A)  xenon 
B)  nitrogen 
C)  iodine 
D)  helium 
E)  fluorine

Question 6

Which of the following is stored under water because of its property of igniting spontaneously upon contact with air?

Accepted Answer

A)  P4 (white phosphorus) 
B)  S8 (yellow sulfur) 
C)  Pb3O4 ("red lead") 
D)  K (potassium metal) 
E)  I2 (crystalline iodine)

Question 7

What is the skeletal structure for chloric acid?

Accepted Answer

A)  H-O-Cl-O-O 
B)  H-Cl-O-O ∣
O 
C)  H-O-O-Cl-O 
D)  H-O-Cl-O ∣
O 
E)  O ∣
H-Cl-O
∣
O

Question 8

Which of the following name/formula combinations is INCORRECT?

Accepted Answer

A)  dioxygen/O2 
B)  familiar oxygen/O 
C)  trioxygen/O3 
D)  ozone/O3 
E)  potassium superoxide/KO2

Question 9

Write a balanced half equation for the following couple: NO3- | NH4+(acidic)

Accepted Answer

A)  NO3- + 3 H2O → NH4+ + 10 H+ + 8 e- 
B)  NO3- + 4 H+ + 3 e- → NH4+ + 3 H2O 
C)  NO3- + 4 H+ → NH4+ + 3 H2O + e- 
D)  NO3- + 8 H+ + 8 e- → NH4+ + 3 H2O 
E)  NO3- + 10 H+ + 8 e- → NH4+ + 3 H2O

Question 10

Hydrogen bonded with any metals form compounds called ionic hydrides.

Accepted Answer

A) True 
 B)False

Question 11

Choose the INCORRECT statement.

Accepted Answer

A)  Sb and As are usually referred to as metalloids. 
B)  Nitrogen is obtained by fractional distillation of liquefied air. 
C)  Phosphorus is important in fertilizers. 
D)  Ar and Sb are used in semiconductor materials. 
E)  Nitrides are compounds of nitrogen in the 3+ oxidation state.

Question 12

Choose the INCORRECT statement.

Accepted Answer

A)  Xenon compounds in several different oxidation states have been formed. 
B)  The noble gas compounds are very stable. 
C)  Xenon compounds are excellent reducing agents. 
D)  The Noble gas (except helium) electron configuration has ns2np6. 
E)  Although predicted in the 1930s, it was 1962 before noble gas compounds were made.

Question 13

Write an equation for the oxidation in acid solution of Mn2+ to MnO4- by XeO3, which is reduced to Xe(g).

Accepted Answer

A)  6 Mn2+ + 5 XeO3 → 6 MnO4- + 5 Xe 
B)  24 H2O + 6 Mn2+ + 5 XeO3 → 6 MnO4- + 5 Xe + 18 H+ 
C)  H2O + Mn2+ + XeO3 → MnO4- + Xe + 2 H+ 
D)  24 H2O + 6 Mn2+ + 5 XeO3 + 30 H+ → 6 MnO4- + 5 Xe + 15 H2O + 48 H+ 
E)  9 H2O + 6 Mn2+ + 5 XeO3 → 6 MnO4- + 5 Xe + 18 H+

Question 14

If a certain natural gas supply contains 2.13% helium by mass, what amount of the natural gas must be processed, at 96.2% efficiency of helium recovery, to produce sufficient helium to inflate 24 party balloons to a volume of 5.3 L each at an internal gas pressure of 1.25 atm and a temperature of 23.7°C?

Accepted Answer

A)  1.28 kg 
B)  1.18 kg 
C)  1.09 kg 
D)  0.82 kg 
E)  0.75 kg

Question 15

"Red" phosphorus is insoluble in carbon disulfide, has a broad melting range and a very low vapor pressure, and does not conduct electricity. This evidence suggests that this substance is probably:

Accepted Answer

A)  crystalline and metallic 
B)  a crystal of P4 molecule units 
C)  amorphous and polymeric 
D)  P4+ ions in a "sea" of electrons 
E)  cubic closest-packed unbonded P atoms

Question 16

Choose the INCORRECT statement.

Accepted Answer

A)  Perbromic acid is HBrO4. 
B)  Bromite ion is BrO2-. 
C)  Iodate ion is IO3-. 
D)  Hypochlorite ion is ClO-. 
E)  Hydrochloric acid is HClO2.

Question 17

Which of these is the strongest oxidizing agent?

Accepted Answer

A)  HClO2 
B)  HClO3 
C)  HClO4 
D)  KClO3 
E)  KClO2

Question 18

Choose the INCORRECT oxidation state for xenon in the listed molecule.

Accepted Answer

A)  XeF2/+2 
B)  XeO3/+4 
C)  XeF6/+6 
D)  XeO4/+8 
E)  XeOF2/+4

Question 19

HI(g) has a ΔGf° that is small and positive, so HI should dissociate to some extent but its activation energy is high. HI(g) is stable at room temperature. Chemists would describe the reason for the very slow dissociation reaction as:

Accepted Answer

A)  thermodynamically controlled 
B)  the ΔGf° is wrong 
C)  the reaction is not slow 
D)  the reaction is kinetically controlled 
E)  the molecules can collide with each other

Question 20

Halogen molecules are diatomic.

Accepted Answer

A) True 
 B)False

Exam 22: Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The VSEPR theory predicts molecular shapes for the noble gas compounds. Which of these is correct? I) XeF2 is linear. II) XeOF2 is T-shaped. III) XeF4 is square planar.

Which of the following is found in Teflon, Freon-12, and in the acid commonly used to etch glass?

The Frasch process for the production of elemental sulfur has been largely supplanted by a gas-phase process using the reduction of sulfur dioxide by:

Iodine is only very slightly soluble in water, but it dissolves readily in an aqueous solution of sodium iodide, because molecular iodine acts as:

The most reactive of the nonmetallic elements is ________.

Which of the following is stored under water because of its property of igniting spontaneously upon contact with air?

What is the skeletal structure for chloric acid?

Which of the following name/formula combinations is INCORRECT?

Write a balanced half equation for the following couple: NO₃^- | NH₄⁺(acidic)

Hydrogen bonded with any metals form compounds called ionic hydrides.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Write an equation for the oxidation in acid solution of Mn²⁺ to MnO₄^- by XeO₃, which is reduced to Xe(g) .

"Red" phosphorus is insoluble in carbon disulfide, has a broad melting range and a very low vapor pressure, and does not conduct electricity. This evidence suggests that this substance is probably:

Choose the INCORRECT statement.

Which of these is the strongest oxidizing agent?

Choose the INCORRECT oxidation state for xenon in the listed molecule.

HI(g) has a ΔGf° that is small and positive, so HI should dissociate to some extent but its activation energy is high. HI(g) is stable at room temperature. Chemists would describe the reason for the very slow dissociation reaction as:

Halogen molecules are diatomic.

Exam 22: Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The VSEPR theory predicts molecular shapes for the noble gas compounds. Which of these is correct? I) XeF2 is linear. II) XeOF2 is T-shaped. III) XeF4 is square planar.

Which of the following is found in Teflon, Freon-12, and in the acid commonly used to etch glass?

The Frasch process for the production of elemental sulfur has been largely supplanted by a gas-phase process using the reduction of sulfur dioxide by:

Iodine is only very slightly soluble in water, but it dissolves readily in an aqueous solution of sodium iodide, because molecular iodine acts as:

The most reactive of the nonmetallic elements is ________.

Which of the following is stored under water because of its property of igniting spontaneously upon contact with air?

What is the skeletal structure for chloric acid?

Which of the following name/formula combinations is INCORRECT?

Write a balanced half equation for the following couple: NO3- | NH4+(acidic)

Hydrogen bonded with any metals form compounds called ionic hydrides.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Write an equation for the oxidation in acid solution of Mn2+ to MnO4- by XeO3, which is reduced to Xe(g) .

"Red" phosphorus is insoluble in carbon disulfide, has a broad melting range and a very low vapor pressure, and does not conduct electricity. This evidence suggests that this substance is probably:

Choose the INCORRECT statement.

Which of these is the strongest oxidizing agent?

Choose the INCORRECT oxidation state for xenon in the listed molecule.

HI(g) has a ΔGf° that is small and positive, so HI should dissociate to some extent but its activation energy is high. HI(g) is stable at room temperature. Chemists would describe the reason for the very slow dissociation reaction as:

Halogen molecules are diatomic.

Write a balanced half equation for the following couple: NO₃^- | NH₄⁺(acidic)

Write an equation for the oxidation in acid solution of Mn²⁺ to MnO₄^- by XeO₃, which is reduced to Xe(g) .