Question 1

Which of the following is the correct half-cell reaction for the anode process in the electrolysis of an aqueous solution of potassium sulfate?

Accepted Answer

The correct half-cell reaction for the anode process in the electrolysis of an aqueous solution of potassium sulfate involves the oxidation of water to produce oxygen gas, protons, and electrons. This is because potassium and sulfate ions are not oxidized or reduced under standard conditions. Option B correctly represents the oxidation of water to oxygen gas, protons, and electrons.

Question 2

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

Accepted Answer

The answer of Which of the following statements about the...

Question 3

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

Accepted Answer

During the electrolysis of NaBr(aq), sodium ions (Na+) are reduced at the cathode, but instead of forming sodium metal (Na(s)), they react with water to produce hydrogen gas and hydroxide ions, making the production of sodium metal (Na(s)) the least likely outcome.

Question 4

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

The answer of What is the correct coefficient for Na₂MnO₄...

Question 5

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

Accepted Answer

The answer of What is the coefficient for sulfur in...

Question 6

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

The answer of The following equation, when balanced, involves a...

Question 7

Complete and balance the following equation: PbO₂(s) + Cl^-(aq) + H⁺(aq) $\rightarrow$ Pb²⁺(aq) + Cl₂(aq)

Accepted Answer

The answer of Complete and balance the following equation: PbO₂(s)...

Question 8

refer to the following reaction in acid solution. CuS(s) + NO₃^-(aq) Cu²⁺(aq) + SO₄^2-(aq) + NO(g) -In the balanced half-reaction for the NO₃^- ion, how many electrons are involved?

Accepted Answer

The answer of  refer to the following reaction in...

Question 9

Which of the following isn't true?

Accepted Answer

The notation NO₃^- represents the nitrate ion, NO₃⁻. In a reaction where CuS acts as the reducing agent, it means CuS is oxidized, implying the oxidation state of copper in CuS changes. Since copper in CuS is initially in the +2 oxidation state (not 0), statement E is incorrect. The nitrate ion, being the oxidizing agent, is reduced.

Question 10

Write a balanced chemical equation for the following reaction. MnO₂(s) + PbO₂(s) + H⁺(aq) $\rightarrow$ MnO₄^-(aq) + Pb²⁺(aq)

Accepted Answer

The answer of Write a balanced chemical equation for the...

Question 11

refer to the following incomplete, unbalanced equation CrS1U1B12S1U1B0OS1U1B17S1U1B0S1U1P12-S1S1P0(aq) + NO(g) CrS1U1P13+S1S1P0(aq) + NOS1U1B13S1U1B0S1U1P1-S1S1P0(aq) -How many electrons are in the half-reaction involving Cr₂O₇^2-?

Accepted Answer

In the half-reaction, Cr2O7^2- is reduced to 2Cr^3+. The change in oxidation state for each Cr is from +6 to +3, which is a change of 3 per Cr atom. Since there are 2 Cr atoms, the total change is 6 electrons.

Question 12

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

The answer of refer to the following incomplete, unbalanced equation
CrS1U1B12S1U1B0OS1U1B17S1U1B0S1U1P12-S1S1P0(aq)...

Question 13

Write a balanced chemical equation for the following reaction, which can be used to standardize aqueous permanganate ion solutions. H₂C₂O₄(aq) + MnO₄^-(aq) + H⁺(aq) $\rightarrow$ CO₂(g) + Mn²⁺(aq)

Accepted Answer

The answer of Write a balanced chemical equation for the...

Question 14

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 15

Balance the following oxidation-reduction equation. HI(aq) + HNO₃(aq) $\rightarrow$NO(g) + I₂(aq)

Accepted Answer

The answer of Balance the following oxidation-reduction equation. HI(aq) + HNO₃(aq)...

Question 16

Balance the following oxidation-reduction equation. CrO₄^2-(aq) + HSnO₂^-(aq) HSnO₃^-(aq) + CrO₂^-(aq)

Accepted Answer

The answer of Balance the following oxidation-reduction equation. CrO₄^2-(aq) + HSnO₂^-(aq) ...

Question 17

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 OCl^- ions are consumed in the balanced equation for this reaction?

Accepted Answer

The answer of Redox Reactions in Basic Solutions
refer to the...

Question 18

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

In basic solutions, OH⁻ ions are added to balance the equation. The simplest balanced equation for this reaction involves 2 OH⁻ ions.

Question 19

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

In basic solutions, redox reactions often involve the consumption or production of hydroxide ions (OH-). The given reaction, despite its unclear chemical notation, implies a redox process in a basic solution. Typically, such reactions can lead to the generation of OH- ions as products, especially when oxygen-containing species are reduced or oxidized, thus increasing the OH- ion concentration.

Question 20

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

In the forward direction, CrO4^2- is reduced to Cr(OH)3, indicating it acts as an oxidizing agent by gaining electrons. In the reverse direction, PO4^3- is oxidized to P, indicating it acts as a reducing agent, making its counterpart, Cr(OH)3, the oxidizing agent.

Quiz 12: Oxidation-Reduction Reactions

Which of the following is the correct half-cell reaction for the anode process in the electrolysis of an aqueous solution of potassium sulfate?

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

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

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!

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

Complete and balance the following equation: PbO₂(s) + Cl^-(aq) + H⁺(aq) $\rightarrow$ Pb²⁺(aq) + Cl₂(aq)

refer to the following reaction in acid solution. CuS(s) + NO₃^-(aq) Cu²⁺(aq) + SO₄^2-(aq) + NO(g) -In the balanced half-reaction for the NO₃^- ion, how many electrons are involved?

Which of the following isn't true?

Write a balanced chemical equation for the following reaction. MnO₂(s) + PbO₂(s) + H⁺(aq) $\rightarrow$ MnO₄^-(aq) + Pb²⁺(aq)

refer to the following incomplete, unbalanced equation Cr₂O₇^2-(aq) + NO(g) Cr³⁺(aq) + NO₃^-(aq) -How many electrons are in the half-reaction involving Cr₂O₇^2-?

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?

Write a balanced chemical equation for the following reaction, which can be used to standardize aqueous permanganate ion solutions. H₂C₂O₄(aq) + MnO₄^-(aq) + H⁺(aq) $\rightarrow$ CO₂(g) + Mn²⁺(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)

Balance the following oxidation-reduction equation. HI(aq) + HNO₃(aq) $\rightarrow$ NO(g) + I₂(aq)

Balance the following oxidation-reduction equation. CrO₄^2-(aq) + HSnO₂^-(aq) HSnO₃^-(aq) + CrO₂^-(aq)

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

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?

Quiz 12: Oxidation-Reduction Reactions

Which of the following is the correct half-cell reaction for the anode process in the electrolysis of an aqueous solution of potassium sulfate?

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

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

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!

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

Complete and balance the following equation: PbO2(s) + Cl-(aq) + H+(aq) →\rightarrow→ Pb2+(aq) + Cl2(aq)

refer to the following reaction in acid solution. CuS(s) + NO3-(aq) Cu2+(aq) + SO42-(aq) + NO(g) -In the balanced half-reaction for the NO3- ion, how many electrons are involved?

Which of the following isn't true?

Write a balanced chemical equation for the following reaction. MnO2(s) + PbO2(s) + H+(aq) →\rightarrow→ MnO4-(aq) + Pb2+(aq)

refer to the following incomplete, unbalanced equation Cr2O72-(aq) + NO(g) Cr3+(aq) + NO3-(aq) -How many electrons are in the half-reaction involving Cr2O72-?

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?

Write a balanced chemical equation for the following reaction, which can be used to standardize aqueous permanganate ion solutions. H2C2O4(aq) + MnO4-(aq) + H+(aq) →\rightarrow→ CO2(g) + Mn2+(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)

Balance the following oxidation-reduction equation. HI(aq) + HNO3(aq) →\rightarrow→ NO(g) + I2(aq)

Balance the following oxidation-reduction equation. CrO42-(aq) + HSnO2-(aq) HSnO3-(aq) + CrO2-(aq)

Redox Reactions in Basic Solutions refer to the following reaction which occurs in basic solution: OCl-(aq) →\rightarrow→ ClO2-(aq) + Cl2(aq) -How many OCl- ions are consumed in the 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) -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?

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?

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!

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

Complete and balance the following equation: PbO₂(s) + Cl^-(aq) + H⁺(aq) $\rightarrow$ Pb²⁺(aq) + Cl₂(aq)

refer to the following reaction in acid solution. CuS(s) + NO₃^-(aq) Cu²⁺(aq) + SO₄^2-(aq) + NO(g) -In the balanced half-reaction for the NO₃^- ion, how many electrons are involved?

Write a balanced chemical equation for the following reaction. MnO₂(s) + PbO₂(s) + H⁺(aq) $\rightarrow$ MnO₄^-(aq) + Pb²⁺(aq)

refer to the following incomplete, unbalanced equation Cr₂O₇^2-(aq) + NO(g) Cr³⁺(aq) + NO₃^-(aq) -How many electrons are in the half-reaction involving Cr₂O₇^2-?

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?

Write a balanced chemical equation for the following reaction, which can be used to standardize aqueous permanganate ion solutions. H₂C₂O₄(aq) + MnO₄^-(aq) + H⁺(aq) $\rightarrow$ CO₂(g) + Mn²⁺(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)

Balance the following oxidation-reduction equation. HI(aq) + HNO₃(aq) $\rightarrow$ NO(g) + I₂(aq)

Balance the following oxidation-reduction equation. CrO₄^2-(aq) + HSnO₂^-(aq) HSnO₃^-(aq) + CrO₂^-(aq)

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

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?