Question 1

What is the correct coefficient for Na2MnO4 in the balanced equation for the air oxidation of manganese dioxide to sodium manganate in the presence of sodium carbonate?
MnO2(s) + Na2CO3(aq) + O2(g)  $\rightarrow$ CO2(g) + Na2MnO4(aq)

Accepted Answer

A)  1 
B)  3/2 
C)  2 
D)  5/2 
E)  3

Question 2

What is the coefficient for sulfur in the following redox reaction?
S(s) + KClO3(s)  $\rightarrow$ SO2(g) + KCl(s) + bang!

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 3

refer to the following reaction which occurs in basic solution.
CrOS1U1B14S1U1B0S1U1P12-S1S1P0 + PHS1U1B13S1U1B0 $\rightarrow$Cr(OH)S1U1B14S1U1B0S1U1P1-S1S1P0 + PS1U1B14S1U1B0
-Which of the following are oxidizing agents in the forward and reverse directions, respectively?

Accepted Answer

A)  CrO42- and PH3 
B)  CrO42- and P4 
C)  Cr(OH)4- and PH3 
D)  Cr(OH)4- and P4 
E)  CrO42- and OH-

Question 4

For the following reaction, identify the oxidizing agents in the forward and reverse directions, respectively..
P4(s) + HNO3(aq)  $\rightarrow$ H3PO4(aq) + NO(g)

Accepted Answer

A)  P4 and H3PO4 
B)  P4 and NO 
C)  P4 and HNO3    
D)  HNO3 and H3PO4 
E)  HNO3 and NO

Question 5

‪  
Determining Oxidation Numbers
-Determine the oxidation number of arsenic in the anion, HAsO42 - .

Accepted Answer

A)  +5 
B)  +6 
C)  +7 
D)  +8 
E)  none of these

Question 6

A current of 2.0 amps passed through a molten solution of the salt MCl2 for a period of 30 minutes produces 1.32 g of Cl2 gas and 0.453 g of M. Which of the following metals is present in this compound?

Accepted Answer

A)  Mg 
B)  Ca 
C)  Zn 
D)  Sr 
E)  Hg

Question 7

Which of the following is true about the reaction below?
2VO2+ (aq) + Br2(s) + 2 H2O(l)  $\rightarrow$ 2VO2+(aq) + 2 Br  - (aq) + 4H+

Accepted Answer

A)  Br2 is acting as a reducing agent. 
B)  VO2+ is acting as a weak reducing agent. 
C)  VO2+ is oxidized. 
D)  H2O is reduced. 
E)  H+ is acting as a weak reducing agent.

Question 8

What is the ratio of the weight of Cl2 produced at the anode to the weight of Al produced at the cathode when 5 moles of electrons are passed through a molten sample of AlCl3?

Accepted Answer

A)  about 2 g Cl2 per 1 g Al 
B)  about 4 g Cl2 per 1 g Al 
C)  about 8 g Cl2 per 1 g Al 
D)  about 16 g Cl2 per 1 g Al 
E)  none of the above

Question 9

Redox Reactions in Basic Solutions
refer to the following reaction which occurs in basic solution:
OClS1U1P1-S1S1P0(aq) $\rightarrow$ ClOS1U1B12S1U1B0S1U1P1-S1S1P0(aq) + ClS1U1B12S1U1B0(aq)
-How many OH- ions are involved in the simplest balanced equation for this reaction?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 10

Which of the following statements about this reaction is correct?

Accepted Answer

A)  H+ is the oxidizing agent and dichromate is the reducing agent. 
B)  Dichromate is oxidized and ethanol is reduced. 
C)  Ethanol is the reducing agent and dichromate is the oxidizing agent. 
D)  This is not an oxidation-reduction reaction. 
E)  None of the above statements is correct.

Question 11

Which of the following pairs of ions can't coexist in aqueous solution under standard-state conditions because a spontaneous redox reaction occurs?

Accepted Answer

A)  Sn4+ and Fe3+ 
B)  Sn4+ and Fe2+ 
C)  Sn2+ and Fe3+ 
D)  Sn2+ and Fe2+ 
E)  None of these pairs of ions can coexist.

Question 12

What is the oxidation state of the tin atom in an unknown salt if 14.8 grams of tin are plated out when a current of 40 amps is passed through a molten solution of this salt for 10 minutes?

Accepted Answer

A)  +1 
B)  +2 
C)  +3 
D)  +4 
E)  +6

Question 13

Redox Reactions in Basic Solutions
refer to the following reaction which occurs in basic solution:
OClS1U1P1-S1S1P0(aq) $\rightarrow$ ClOS1U1B12S1U1B0S1U1P1-S1S1P0(aq) + ClS1U1B12S1U1B0(aq)
-What is the net effect on the OH- ion concentration in this reaction?

Accepted Answer

A)  The OH- ion concentration increases. 
B)  The OH- ion concentration decreases. 
C)  The OH- ion concentration remains the same. 
D)  There is no way to predict what happens to the OH- ion concentration in this reaction.

Question 14

Use a table of standard reduction potentials to determine which of the following is the strongest reducing agent.

Accepted Answer

A)  Co 
B)  Ca2+ 
C)  Co3+ 
D)  Cr 
E)  Au

Question 15

The following equation, when balanced, involves a total of ___ electrons.
ClO3-(aq) + I2(aq) + H2O(l)  $\rightarrow$ IO3-(aq) + Cl-(aq) + H+(aq)

Accepted Answer

A)  5 
B)  6 
C)  12 
D)  24 
E)  30

Question 16

Which of the following statements about the electrolysis of an aqueous solution of NaCl is true?

Accepted Answer

A)  O2 is liberated at the cathode. 
B)  H2 is liberated at the cathode. 
C)  Na is liberated at the cathode. 
D)  Cl2 is liberated at the cathode. 
E)  The decomposition potential must not be exceeded.

Question 17

Balance the following redox reaction. Clearly show the two balanced half-reactions and indicate which represents oxidation and which reduction. H₂O₂(aq) + NO(g) + H⁺(aq) $\rightarrow$ NO₃^-(aq)

Accepted Answer

The answer of Balance the following redox reaction. Clearly show...

Question 18

In the electrolysis of NaBr(aq), which of the following products is least likely to be found?

Accepted Answer

A)  H2(g) 
B)  O2(g) 
C)  Br2(l) 
D)  Na(s) 
E)  NaOH(aq)

Question 19

A current of 1.5 amps is applied to a 1.00 L solution of 0.100 M hydrochloric acid for 1.0 hr. What is the pH of the solution after electrolysis is complete?

Accepted Answer

The answer of A current of 1.5 amps is applied...

Question 20

refer to the following incomplete, unbalanced equation
CrS1U1B12S1U1B0OS1U1B17S1U1B0S1U1P12-S1S1P0(aq) + NO(g)
  CrS1U1P13+S1S1P0(aq) + NOS1U1B13S1U1B0S1U1P1-S1S1P0(aq)
-What is the coefficient of the NO in the balanced equation?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  6

Exam 12: Oxidation-Reduction Reactions

What is the correct coefficient for Na₂MnO₄ in the balanced equation for the air oxidation of manganese dioxide to sodium manganate in the presence of sodium carbonate? MnO₂(s) + Na₂CO₃(aq) + O₂(g) $\rightarrow$ CO₂(g) + Na₂MnO₄(aq)

What is the coefficient for sulfur in the following redox reaction? S(s) + KClO₃(s) $\rightarrow$ SO₂(g) + KCl(s) + bang!

refer to the following reaction which occurs in basic solution. CrO₄^2- + PH₃ $\rightarrow$ Cr(OH) ₄^- + P₄ -Which of the following are oxidizing agents in the forward and reverse directions, respectively?

For the following reaction, identify the oxidizing agents in the forward and reverse directions, respectively.. P₄(s) + HNO₃(aq) $\rightarrow$ H₃PO₄(aq) + NO(g)

‪ Determining Oxidation Numbers -Determine the oxidation number of arsenic in the anion, HAsO₄² ^- .

A current of 2.0 amps passed through a molten solution of the salt MCl₂ for a period of 30 minutes produces 1.32 g of Cl₂ gas and 0.453 g of M. Which of the following metals is present in this compound?

Which of the following is true about the reaction below? 2VO²⁺(aq) + Br₂(s) + 2 H₂O(l) $\rightarrow$ 2VO₂⁺(aq) + 2 Br ^- (aq) + 4H⁺

What is the ratio of the weight of Cl₂ produced at the anode to the weight of Al produced at the cathode when 5 moles of electrons are passed through a molten sample of AlCl₃?

Redox Reactions in Basic Solutions refer to the following reaction which occurs in basic solution: OCl^-(aq) $\rightarrow$ ClO₂^-(aq) + Cl₂(aq) -How many OH^- ions are involved in the simplest balanced equation for this reaction?

Which of the following statements about this reaction is correct?

Which of the following pairs of ions can't coexist in aqueous solution under standard-state conditions because a spontaneous redox reaction occurs?

What is the oxidation state of the tin atom in an unknown salt if 14.8 grams of tin are plated out when a current of 40 amps is passed through a molten solution of this salt for 10 minutes?

Redox Reactions in Basic Solutions refer to the following reaction which occurs in basic solution: OCl^-(aq) $\rightarrow$ ClO₂^-(aq) + Cl₂(aq) -What is the net effect on the OH^- ion concentration in this reaction?

Use a table of standard reduction potentials to determine which of the following is the strongest reducing agent.

The following equation, when balanced, involves a total of ___ electrons. ClO₃^-(aq) + I₂(aq) + H₂O(l) $\rightarrow$ IO₃^-(aq) + Cl^-(aq) + H⁺(aq)

Which of the following statements about the electrolysis of an aqueous solution of NaCl is true?

Balance the following redox reaction. Clearly show the two balanced half-reactions and indicate which represents oxidation and which reduction. H₂O₂(aq) + NO(g) + H⁺(aq) $\rightarrow$ NO₃^-(aq)

In the electrolysis of NaBr(aq) , which of the following products is least likely to be found?

A current of 1.5 amps is applied to a 1.00 L solution of 0.100 M hydrochloric acid for 1.0 hr. What is the pH of the solution after electrolysis is complete?

refer to the following incomplete, unbalanced equation Cr₂O₇^2-(aq) + NO(g) Cr³⁺(aq) + NO₃^-(aq) -What is the coefficient of the NO in the balanced equation?

Exam 12: Oxidation-Reduction Reactions

What is the correct coefficient for Na2MnO4 in the balanced equation for the air oxidation of manganese dioxide to sodium manganate in the presence of sodium carbonate? MnO2(s) + Na2CO3(aq) + O2(g) →\rightarrow→ CO2(g) + Na2MnO4(aq)

What is the coefficient for sulfur in the following redox reaction? S(s) + KClO3(s) →\rightarrow→ SO2(g) + KCl(s) + bang!

refer to the following reaction which occurs in basic solution. CrO42- + PH3 →\rightarrow→ Cr(OH) 4- + P4 -Which of the following are oxidizing agents in the forward and reverse directions, respectively?

For the following reaction, identify the oxidizing agents in the forward and reverse directions, respectively.. P4(s) + HNO3(aq) →\rightarrow→ H3PO4(aq) + NO(g)

‪ Determining Oxidation Numbers -Determine the oxidation number of arsenic in the anion, HAsO42 - .

A current of 2.0 amps passed through a molten solution of the salt MCl2 for a period of 30 minutes produces 1.32 g of Cl2 gas and 0.453 g of M. Which of the following metals is present in this compound?

Which of the following is true about the reaction below? 2VO2+ (aq) + Br2(s) + 2 H2O(l) →\rightarrow→ 2VO2+(aq) + 2 Br - (aq) + 4H+

What is the ratio of the weight of Cl2 produced at the anode to the weight of Al produced at the cathode when 5 moles of electrons are passed through a molten sample of AlCl3?

Redox Reactions in Basic Solutions refer to the following reaction which occurs in basic solution: OCl-(aq) →\rightarrow→ ClO2-(aq) + Cl2(aq) -How many OH- ions are involved in the simplest balanced equation for this reaction?

Which of the following statements about this reaction is correct?

Which of the following pairs of ions can't coexist in aqueous solution under standard-state conditions because a spontaneous redox reaction occurs?

What is the oxidation state of the tin atom in an unknown salt if 14.8 grams of tin are plated out when a current of 40 amps is passed through a molten solution of this salt for 10 minutes?

Redox Reactions in Basic Solutions refer to the following reaction which occurs in basic solution: OCl-(aq) →\rightarrow→ ClO2-(aq) + Cl2(aq) -What is the net effect on the OH- ion concentration in this reaction?

Use a table of standard reduction potentials to determine which of the following is the strongest reducing agent.

The following equation, when balanced, involves a total of ___ electrons. ClO3-(aq) + I2(aq) + H2O(l) →\rightarrow→ IO3-(aq) + Cl-(aq) + H+(aq)

Which of the following statements about the electrolysis of an aqueous solution of NaCl is true?

Balance the following redox reaction. Clearly show the two balanced half-reactions and indicate which represents oxidation and which reduction. H2O2(aq) + NO(g) + H+(aq) →\rightarrow→ NO3-(aq)

In the electrolysis of NaBr(aq) , which of the following products is least likely to be found?

A current of 1.5 amps is applied to a 1.00 L solution of 0.100 M hydrochloric acid for 1.0 hr. What is the pH of the solution after electrolysis is complete?

refer to the following incomplete, unbalanced equation Cr2O72-(aq) + NO(g) Cr3+(aq) + NO3-(aq) -What is the coefficient of the NO in the balanced equation?

What is the correct coefficient for Na₂MnO₄ in the balanced equation for the air oxidation of manganese dioxide to sodium manganate in the presence of sodium carbonate? MnO₂(s) + Na₂CO₃(aq) + O₂(g) $\rightarrow$ CO₂(g) + Na₂MnO₄(aq)

What is the coefficient for sulfur in the following redox reaction? S(s) + KClO₃(s) $\rightarrow$ SO₂(g) + KCl(s) + bang!

refer to the following reaction which occurs in basic solution. CrO₄^2- + PH₃ $\rightarrow$ Cr(OH) ₄^- + P₄ -Which of the following are oxidizing agents in the forward and reverse directions, respectively?

For the following reaction, identify the oxidizing agents in the forward and reverse directions, respectively.. P₄(s) + HNO₃(aq) $\rightarrow$ H₃PO₄(aq) + NO(g)

‪ Determining Oxidation Numbers -Determine the oxidation number of arsenic in the anion, HAsO₄² ^- .

A current of 2.0 amps passed through a molten solution of the salt MCl₂ for a period of 30 minutes produces 1.32 g of Cl₂ gas and 0.453 g of M. Which of the following metals is present in this compound?

Which of the following is true about the reaction below? 2VO²⁺(aq) + Br₂(s) + 2 H₂O(l) $\rightarrow$ 2VO₂⁺(aq) + 2 Br ^- (aq) + 4H⁺

What is the ratio of the weight of Cl₂ produced at the anode to the weight of Al produced at the cathode when 5 moles of electrons are passed through a molten sample of AlCl₃?

Redox Reactions in Basic Solutions refer to the following reaction which occurs in basic solution: OCl^-(aq) $\rightarrow$ ClO₂^-(aq) + Cl₂(aq) -How many OH^- ions are involved in the simplest balanced equation for this reaction?

Redox Reactions in Basic Solutions refer to the following reaction which occurs in basic solution: OCl^-(aq) $\rightarrow$ ClO₂^-(aq) + Cl₂(aq) -What is the net effect on the OH^- ion concentration in this reaction?

The following equation, when balanced, involves a total of ___ electrons. ClO₃^-(aq) + I₂(aq) + H₂O(l) $\rightarrow$ IO₃^-(aq) + Cl^-(aq) + H⁺(aq)

Balance the following redox reaction. Clearly show the two balanced half-reactions and indicate which represents oxidation and which reduction. H₂O₂(aq) + NO(g) + H⁺(aq) $\rightarrow$ NO₃^-(aq)

refer to the following incomplete, unbalanced equation Cr₂O₇^2-(aq) + NO(g) Cr³⁺(aq) + NO₃^-(aq) -What is the coefficient of the NO in the balanced equation?