Question 1

Which of the following processes is a reduction reaction?

Accepted Answer

A) 2 Br- becoming Br2 
B) Ni2+ becoming Ni3+ 
C) Hg22+ becoming 2 Hg 
D) Tin(II)becoming tin(IV) 
E) Iron(II)becoming iron(III) 
A) 2 Br- becoming Br2 
B) Ni2+ becoming Ni3+ 
C) Hg22+ becoming 2 Hg 
D) Tin(II)becoming tin(IV) 
E) Iron(II)becoming iron(III)

Question 2

Which of the following substances is most likely to be a reducing agent?

Accepted Answer

A) NH4+ 
B) S2- 
C) Mg2+ 
D) KMnO4 
E) Cl2 
A) NH4+ 
B) S2- 
C) Mg2+ 
D) KMnO4 
E) Cl2

Question 3

In comparing acid-base neutralization reactions and redox reactions,which of the following is correct?

Accepted Answer

A) A strong acid readily gains protons while a strong oxidizing agent readily gains electrons. 
B) A strong acid readily provides protons while a strong reducing agent readily gains electrons. 
C) A strong base readily gains protons while a strong oxidizing agent readily gains electrons. 
D) A strong base readily provides protons while a strong reducing agent readily loses electrons. 
A) A strong acid readily gains protons while a strong oxidizing agent readily gains electrons. 
B) A strong acid readily provides protons while a strong reducing agent readily gains electrons. 
C) A strong base readily gains protons while a strong oxidizing agent readily gains electrons. 
D) A strong base readily provides protons while a strong reducing agent readily loses electrons.

Question 4

What evidence suggests that Na+ ions are very weak oxidizing agents?

Accepted Answer

A) NaCl is a strong electrolyte 
B) Na metal does not occur in the Earth's crust 
C) NaOH is a strong base 
D) Na metal is soft and can be cut with a knife 
E) Na+ ions are a component of table salt 
A) NaCl is a strong electrolyte 
B) Na metal does not occur in the Earth's crust 
C) NaOH is a strong base 
D) Na metal is soft and can be cut with a knife 
E) Na+ ions are a component of table salt

Question 5

Which of the following statements is incorrect?

Accepted Answer

A) Acid-base reactions involve a transfer of protons; redox reactions,a transfer of electrons 
B) In both redox and acid-base reactions,the reactants are given special names to indicate their roles in the transfer process 
C) Just as certain species can either donate or accept protons and thereby behave as an acid in one reaction and a base in another,certain species can either accept or donate electrons,acting as an oxidizing agent in one reaction and a reducing agent in another 
D) Just as acids and bases may be classified as "strong" or "weak" depending on how readily they donate or accept protons,the strengths of oxidizing and reducing agents may be compared according to their tendencies to attract or release electrons 
E) Unlike most acid-base reactions in aqueous solution,which reach a state of equilibrium,most aqueous redox reactions do not reach a state of equilibrium and proceed entirely in either the forward or reverse direction 
A) Acid-base reactions involve a transfer of protons; redox reactions,a transfer of electrons 
B) In both redox and acid-base reactions,the reactants are given special names to indicate their roles in the transfer process 
C) Just as certain species can either donate or accept protons and thereby behave as an acid in one reaction and a base in another,certain species can either accept or donate electrons,acting as an oxidizing agent in one reaction and a reducing agent in another 
D) Just as acids and bases may be classified as "strong" or "weak" depending on how readily they donate or accept protons,the strengths of oxidizing and reducing agents may be compared according to their tendencies to attract or release electrons 
E) Unlike most acid-base reactions in aqueous solution,which reach a state of equilibrium,most aqueous redox reactions do not reach a state of equilibrium and proceed entirely in either the forward or reverse direction

Question 6

Silver metal will not react with hydrochloric acid.What does this suggest about silver and hydrochloric acid?

Accepted Answer

A) HCl is a weak acid 
B) HCl is a strong acid 
C) Ag is a weaker reducing agent than H+ in HCl(aq) 
D) Ag is a stronger oxidizing agent than HCl 
E) No conclusion can be made based on this information 
A) HCl is a weak acid 
B) HCl is a strong acid 
C) Ag is a weaker reducing agent than H+ in HCl(aq) 
D) Ag is a stronger oxidizing agent than HCl 
E) No conclusion can be made based on this information

Question 7

Which of the following is the correct net ionic equation for the redox reaction between zinc and the copper(II)ion and the correct direction that is favored? The half-reactions are:
Cu2+ + 2 e-  
Cu(s)Zn2+ + 2 e-  
Zn(s)Cu2+ is a stronger oxidizing agent than Zn2+.

Accepted Answer

A) Cu2+(aq)+ Zn(s)   Cu(s)+ Zn2+(aq)reverse 
B) Cu2+(aq)+ Zn(s)   Cu(s)+ Zn2+(aq)forward 
C) Cu2+(aq)+ Zn2+(s)   Cu(s)+ Zn(s) reverse 
D) Cu2+(aq)+ Zn2+(s)   Cu(s)+ Zn(s) forward 
E) Zn(s)+ Cu2+(aq)   Zn+(aq)+ Cu+(aq)forward 
A) Cu2+(aq)+ Zn(s)   Cu(s)+ Zn2+(aq)reverse 
B) Cu2+(aq)+ Zn(s)   Cu(s)+ Zn2+(aq)forward 
C) Cu2+(aq)+ Zn2+(s)   Cu(s)+ Zn(s) reverse 
D) Cu2+(aq)+ Zn2+(s)   Cu(s)+ Zn(s) forward 
E) Zn(s)+ Cu2+(aq)   Zn+(aq)+ Cu+(aq)forward

Question 8

Which of the following is the correct net ionic equation for the redox reaction between nickel ion and metallic silver and the correct direction that is favored? The half reactions are:
Ag+ + e-  
Ag(s)Ni2+ + 2e-  
Ni(s)Ag+ is a stronger oxidizing agent than Ni2+.

Accepted Answer

A) Ni2+(aq)+ Ag(s)+ e-   Ni(s)+ Ag+ (aq)forward 
B) Ni2+(aq)+ Ag(s)+ e-   Ni(s)+ Ag+(aq)reverse 
C) Ni2+(aq)+ Ag(s)   Ni(s)+ 2 Ag+(aq)reverse 
D) Ni2+(aq)+ 2 Ag(s)   Ni(s)+ 2 Ag+(aq)forward 
E) Ni2+(aq)+ 2 Ag(s)   Ni(s)+ 2 Ag+(aq)reverse 
A) Ni2+(aq)+ Ag(s)+ e-   Ni(s)+ Ag+ (aq)forward 
B) Ni2+(aq)+ Ag(s)+ e-   Ni(s)+ Ag+(aq)reverse 
C) Ni2+(aq)+ Ag(s)   Ni(s)+ 2 Ag+(aq)reverse 
D) Ni2+(aq)+ 2 Ag(s)   Ni(s)+ 2 Ag+(aq)forward 
E) Ni2+(aq)+ 2 Ag(s)   Ni(s)+ 2 Ag+(aq)reverse

Question 9

Oxidation-reduction reactions are also known as...

Accepted Answer

A) electron-transfer reactions 
B) proton-transfer reactions 
C) neutron bombardment reactions 
D) neutralization reactions 
E) double displacement reactions 
A) electron-transfer reactions 
B) proton-transfer reactions 
C) neutron bombardment reactions 
D) neutralization reactions 
E) double displacement reactions

Question 10

What is the oxidation number of chromium in Cr2O72-?

Accepted Answer

A) +12 
B) +3 
C) +6 
D) -2 
E) -1 
A) +12 
B) +3 
C) +6 
D) -2 
E) -1

Question 11

Consider the following images.The reactions occurring in each are shown in the choices.

A B C D
Which of the following is an example of an electron transfer reaction?

Accepted Answer

A) Pb(NO3)2(aq)+ Na2SO4(aq)   2 NaNO3(aq)+ PbSO4(s) 
B) H2CO3(aq)   H2O(l)+ CO2(g) 
C) Ca(s)+ 2HCl(aq)   CaCl2(aq)+ H2(g) 
D) Zn(s)+ Cu2+(aq)   Zn2+(aq)+ Cu(s) 
E) Both c and d are electron transfer reactions. 
A) Pb(NO3)2(aq)+ Na2SO4(aq)   2 NaNO3(aq)+ PbSO4(s) 
B) H2CO3(aq)   H2O(l)+ CO2(g) 
C) Ca(s)+ 2HCl(aq)   CaCl2(aq)+ H2(g) 
D) Zn(s)+ Cu2+(aq)   Zn2+(aq)+ Cu(s) 
E) Both c and d are electron transfer reactions.

Question 12

Match each term with its correct classification:
Proton Donor Proton Acceptor Electron Donor Electron Acceptor

Accepted Answer

A) Reducing Agent Oxidizing Agent Acid Base 
B) Base Acid Reducing Agent Oxidizing Agent 
C) Base Acid Oxidizing Agent Reducing Agent 
D) Acid Base Reducing Agent Oxidizing Agent 
E) Acid Base Oxidizing Agent Reducing Agent 
A) Reducing Agent Oxidizing Agent Acid Base 
B) Base Acid Reducing Agent Oxidizing Agent 
C) Base Acid Oxidizing Agent Reducing Agent 
D) Acid Base Reducing Agent Oxidizing Agent 
E) Acid Base Oxidizing Agent Reducing Agent

Question 13

What happens in a galvanic cell?

Accepted Answer

A) Cations are changed into ions 
B) Chemical energy is converted to electrical energy 
C) Anions combine with cations to produce electricity 
D) Less reactive metals are turned into more reactive metals by the action of an electric current 
E) Matter is changed into energy 
A) Cations are changed into ions 
B) Chemical energy is converted to electrical energy 
C) Anions combine with cations to produce electricity 
D) Less reactive metals are turned into more reactive metals by the action of an electric current 
E) Matter is changed into energy

Question 14

Reduction can be defined as...

Accepted Answer

A) a increase in oxidation number 
B) the gain of protons 
C) the loss of protons 
D) a gain of electrons 
E) a loss of electrons 
A) a increase in oxidation number 
B) the gain of protons 
C) the loss of protons 
D) a gain of electrons 
E) a loss of electrons

Question 15

Which of the following cannot be a reducing agent?

Accepted Answer

A) H+(aq) 
B) H2(g) 
C) H2O2(   ) 
D) CH4(g) 
E) All of the above can be a reducing agent 
A) H+(aq) 
B) H2(g) 
C) H2O2(   ) 
D) CH4(g) 
E) All of the above can be a reducing agent

Question 16

Balance the following redox equation in acidic solution and determine the coefficient placed in front of H2O: ___ Cu + ___ NO3- + ___ H+   ___ Cu2+ + ___ NO + ___ H2O

Accepted Answer

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

Question 17

In balancing the half-reaction
NO(g)  
NO3-(aq)in acidic solution,how many electrons are added,and to which side?

Accepted Answer

A) 1 electron to the right side 
B) 3 electrons to the left side 
C) 5 electrons to the left side 
D) 5 electrons to the right side 
E) 3 electrons to the right side 
A) 1 electron to the right side 
B) 3 electrons to the left side 
C) 5 electrons to the left side 
D) 5 electrons to the right side 
E) 3 electrons to the right side

Question 18

Balance the half-reaction in acidic solution and determine the coefficient for hydrogen ion:
___ Cr3+ + ___ H2O  
___ Cr2O72- + ___ H+

Accepted Answer

A) 2 
B) 5 
C) 8 
D) 11 
E) 14 
A) 2 
B) 5 
C) 8 
D) 11 
E) 14

Question 19

Which of the following is a reduction reaction?

Accepted Answer

A) Conversion of 2 Cl- to Cl2 
B) Conversion of copper(I)ions into copper(II)ions 
C) Conversion of Ag+ into Ag 
D) Conversion of Al3+ to Al 
E) Conversion of plutonium into uranium 
A) Conversion of 2 Cl- to Cl2 
B) Conversion of copper(I)ions into copper(II)ions 
C) Conversion of Ag+ into Ag 
D) Conversion of Al3+ to Al 
E) Conversion of plutonium into uranium

Question 20

What happens to an elemental oxidizing agent in a redox reaction?

Accepted Answer

A) It speeds the rate of the reaction although it doesn't actually participate in the reaction 
B) It gives up some of its electrons 
C) It increases the oxidation number 
D) It gets oxidized 
E) It gets reduced 
A) It speeds the rate of the reaction although it doesn't actually participate in the reaction 
B) It gives up some of its electrons 
C) It increases the oxidation number 
D) It gets oxidized 
E) It gets reduced

Exam 19: Oxidation-Reduction Redoxreactions

Which of the following processes is a reduction reaction?

Which of the following substances is most likely to be a reducing agent?

In comparing acid-base neutralization reactions and redox reactions,which of the following is correct?

What evidence suggests that Na+ ions are very weak oxidizing agents?

Which of the following statements is incorrect?

Silver metal will not react with hydrochloric acid.What does this suggest about silver and hydrochloric acid?

Which of the following is the correct net ionic equation for the redox reaction between zinc and the copper(II)ion and the correct direction that is favored? The half-reactions are: Cu2+ + 2 e- Cu(s)Zn2+ + 2 e- Zn(s)Cu2+ is a stronger oxidizing agent than Zn2+.

Which of the following is the correct net ionic equation for the redox reaction between nickel ion and metallic silver and the correct direction that is favored? The half reactions are: Ag+ + e- Ag(s)Ni2+ + 2e- Ni(s)Ag+ is a stronger oxidizing agent than Ni2+.

Oxidation-reduction reactions are also known as...

What is the oxidation number of chromium in Cr2O72-?

Consider the following images.The reactions occurring in each are shown in the choices. A B C D Which of the following is an example of an electron transfer reaction?

Match each term with its correct classification: Proton Donor Proton Acceptor Electron Donor Electron Acceptor

What happens in a galvanic cell?

Reduction can be defined as...

Which of the following cannot be a reducing agent?

Balance the following redox equation in acidic solution and determine the coefficient placed in front of H2O: ___ Cu + ___ NO3- + ___ H+ ___ Cu2+ + ___ NO + ___ H2O

In balancing the half-reaction NO(g) NO3-(aq)in acidic solution,how many electrons are added,and to which side?

Balance the half-reaction in acidic solution and determine the coefficient for hydrogen ion: ___ Cr3+ + ___ H2O ___ Cr2O72- + ___ H+

Which of the following is a reduction reaction?

What happens to an elemental oxidizing agent in a redox reaction?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Atomic Theory: the Nuclear Model of the Atom

Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

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Quantity Relationships in Chemical Reactions

Atomic Theory: the Quantum Model of the Atom

Chemical Bonding

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The Ideal Gas Law and Its Applications

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What evidence suggests that Na⁺ ions are very weak oxidizing agents?

Which of the following is the correct net ionic equation for the redox reaction between zinc and the copper(II)ion and the correct direction that is favored? The half-reactions are: Cu²⁺ + 2 e^- Cu(s)Zn²⁺ + 2 e^- Zn(s)Cu²⁺ is a stronger oxidizing agent than Zn²⁺.

Which of the following is the correct net ionic equation for the redox reaction between nickel ion and metallic silver and the correct direction that is favored? The half reactions are: Ag⁺ + e^- Ag(s)Ni²⁺ + 2e^- Ni(s)Ag⁺ is a stronger oxidizing agent than Ni²⁺.

What is the oxidation number of chromium in Cr₂O₇²^-?

Balance the following redox equation in acidic solution and determine the coefficient placed in front of H₂O: _ Cu + _ NO₃^- + _ H⁺ _ Cu²⁺ + _ NO + _ H₂O

In balancing the half-reaction NO(g) NO₃^-(aq)in acidic solution,how many electrons are added,and to which side?

Balance the half-reaction in acidic solution and determine the coefficient for hydrogen ion: _ Cr³⁺ + _ H₂O _ Cr₂O₇²^- + _ H⁺