Question 1

Which reaction below can be classified as a redox/decomposition reaction?

Accepted Answer

A)   2 CuO  →\rightarrow→  2 Cu + O2
B)   2 NO + O2 →\rightarrow→  2 NO2
C)   Sn + Cu(NO3) 2 →\rightarrow→  Sn(NO3) 2 + Cu
D)   Cu(NO3) 2 + 2 NaOH →\rightarrow→ Cu(OH) 2 + 2 NaNO3

Question 2

The pure element zinc has an oxidation number of ________, while in a compound like ZnSO4 the oxidation number for zinc is ________.

Accepted Answer

A)   0, 0
B)   0, +1
C)   +1, 0
D)   0, +2

Question 3

Which of the following reactions is not a redox reaction?

Accepted Answer

A)   SO3 + H2O  →\rightarrow→ H2SO4
B)   2 Na + Mg2+  →\rightarrow→  Mg + 2 Na+
C)   Cl2 + 2I-  →\rightarrow→  2 Cl- + I2
D)   Na + AgNO3  →\rightarrow→  NaNO3 + Ag

Question 4

In the redox reaction: Al + MnO2  →\rightarrow→  Al2O3 + Mn, the oxidizing agent is ________.

Accepted Answer

A)   Al
B)   Mn in MnO2
C)   O in MnO2
D)   O in Al2O3

Question 5

When the following equation is balanced, by the half reaction method, in an acidic solution what is the sum of the coefficients?
HNO2 + Cr2O7-2  →\rightarrow→  Cr+3 + NO3-

Accepted Answer

A)   17
B)   18
C)   19
D)   20

Question 6

Which substance is serving as the reducing agent in the following reaction?
Fe2S3 + 12 HNO3  →\rightarrow→  2 Fe(NO3) 3 + 3 S + 6 NO2 + 6 H2O

Accepted Answer

A)   HNO3
B)   S
C)   NO2
D)   Fe2S3

Question 7

Balance the following net ionic equation using the half reaction method (in acidic solution) . What is the sum of the coefficients for the balanced reaction?
MnO4- + SO32- →\rightarrow→  Mn2+ + SO42-

Accepted Answer

A)   27
B)   29
C)   21
D)   23

Question 8

Balance the following half reaction in acidic solution.
NO3? ? NO

Accepted Answer

3 e^? + 4 H⁺ ...

Question 9

In which of the following compounds is the oxidation number of hydrogen not +1?

Accepted Answer

A)   NaH
B)   H2SO4
C)   NaClO2
D)   NH3

Question 10

In the redox reaction: BaSO4 + 4 C  →\rightarrow→ BaS + 4 CO, the element reduced is ________.

Accepted Answer

A)   S in BaSO4
B)   C
C)   Ba in BaS
D)   O in CO  A

Question 11

Balance the following half reaction in basic solution.
S2? ? SO32?

Accepted Answer

6 OH^? + S^2? ?...

Question 12

In the redox reaction: 4 Cr + 3 O2 + 12 HBr  →\rightarrow→  4 CrBr3 + 6 H2O the change in oxidation number for O is from ________.

Accepted Answer

A)   +4 to -4
B)   +2 to 0
C)   0 to -2
D)   +3 to 0  C

Question 13

+7 is the oxidation number of ________.

Accepted Answer

A)   C in MgC2O4
B)   S in H2SO4
C)   Mn in KMnO4
D)   Br in NaBrO3

Question 14

Indicate the missing words (or phrases)  in the following definition: "An oxidation number is the ________ that an atom ________ when the electrons in each bond it is participating in are assigned to the ________ electronegative of the two atoms involved in the bond."

Accepted Answer

A)   number of electrons, definitely has, more
B)   number of electrons, appears to have, less
C)   charge, appears to have, more
D)   charge, definitely has, less

Question 15

In which of the following compounds is the oxidation number of oxygen not ?2?

Accepted Answer

A)   Ba(OH) 2
B)   Li2O2
C)   NaClO2
D)   Na2SO4 B

Question 16

Determine the oxidation number of C in NaHCO3.

Accepted Answer

A)   +6
B)   +12
C)   +4
D)   +5

Question 17

Which of the following is a correct statement about galvanic cells?

Accepted Answer

A)   Chemical energy is converted entirely into heat energy.
B)   They are always based on a nonspontaneous redox reaction.
C)   They may employ an oxidation process or a reduction process but never both.
D)   Electrical energy is produced from a spontaneous redox reaction.

Question 18

The oxidation number of Cr in K2Cr2O7 is ________.

Accepted Answer

A)   +6
B)   +5
C)   +4
D)   +2

Question 19

When the half-reaction: MnO4-  →\rightarrow→  Mn2+ (acidic solution)  is correctly balanced, ________.

Accepted Answer

A)   the H+ and H2O are both on the left side of the equation
B)   the H+ and H2O are both on the right side of the equation
C)   the H+ is on the left side, and the H2O on the right side of the equation
D)   the H+ is on the right side, and the H2O on the left side of the equation

Question 20

Which of the following statements concerning the lead storage battery is incorrect?

Accepted Answer

A)   PbSO4 is produced during the discharging of the battery.
B)   PbO2 is consumed during the recharging of the battery.
C)   Pb serves as the anode.
D)   Pb coated with PbO2 serves as the cathode.

Exam 15: Oxidation and Reduction

Which reaction below can be classified as a redox/decomposition reaction?

Correct AnswerverifiedShow Answer

The pure element zinc has an oxidation number of ________, while in a compound like ZnSO4 the oxidation number for zinc is ________.

Correct AnswerverifiedShow Answer

Which of the following reactions is not a redox reaction?

Correct AnswerverifiedShow Answer

In the redox reaction: Al + MnO2 →\rightarrow→ Al2O3 + Mn, the oxidizing agent is ________.

Correct AnswerverifiedShow Answer

When the following equation is balanced, by the half reaction method, in an acidic solution what is the sum of the coefficients? HNO2 + Cr2O7-2 →\rightarrow→ Cr+3 + NO3-

Correct AnswerverifiedShow Answer

Which substance is serving as the reducing agent in the following reaction? Fe2S3 + 12 HNO3 →\rightarrow→ 2 Fe(NO3) 3 + 3 S + 6 NO2 + 6 H2O

Correct AnswerverifiedShow Answer

Balance the following net ionic equation using the half reaction method (in acidic solution) . What is the sum of the coefficients for the balanced reaction? MnO4- + SO32- →\rightarrow→ Mn2+ + SO42-

Correct AnswerverifiedShow Answer

Balance the following half reaction in acidic solution. NO3? ? NO

Correct Answerverified3 e? + 4 H+ ...View AnswerShow Answer

In which of the following compounds is the oxidation number of hydrogen not +1?

Correct AnswerverifiedShow Answer

In the redox reaction: BaSO4 + 4 C →\rightarrow→ BaS + 4 CO, the element reduced is ________.

Correct AnswerverifiedA

Balance the following half reaction in basic solution. S2? ? SO32?

Correct Answerverified6 OH? + S2? ?...View AnswerShow Answer

In the redox reaction: 4 Cr + 3 O2 + 12 HBr →\rightarrow→ 4 CrBr3 + 6 H2O the change in oxidation number for O is from ________.

Correct AnswerverifiedC

+7 is the oxidation number of ________.

Correct AnswerverifiedShow Answer

Indicate the missing words (or phrases) in the following definition: "An oxidation number is the ________ that an atom ________ when the electrons in each bond it is participating in are assigned to the ________ electronegative of the two atoms involved in the bond."

Correct AnswerverifiedShow Answer

In which of the following compounds is the oxidation number of oxygen not ?2?

Correct AnswerverifiedB

Determine the oxidation number of C in NaHCO3.

Correct AnswerverifiedShow Answer

Which of the following is a correct statement about galvanic cells?

Correct AnswerverifiedShow Answer

The oxidation number of Cr in K2Cr2O7 is ________.

Correct AnswerverifiedShow Answer

When the half-reaction: MnO4- →\rightarrow→ Mn2+ (acidic solution) is correctly balanced, ________.

Correct AnswerverifiedShow Answer

Which of the following statements concerning the lead storage battery is incorrect?

Correct AnswerverifiedShow Answer

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The pure element zinc has an oxidation number of , while in a compound like ZnSO₄ the oxidation number for zinc is .

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In the redox reaction: Al + MnO₂ $\rightarrow$ Al₂O₃ + Mn, the oxidizing agent is ________.

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When the following equation is balanced, by the half reaction method, in an acidic solution what is the sum of the coefficients? HNO₂ + Cr₂O₇^-2 $\rightarrow$ Cr⁺³ + NO₃^-

Correct Answer
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Which substance is serving as the reducing agent in the following reaction? Fe₂S₃ + 12 HNO₃ $\rightarrow$ 2 Fe(NO₃) ₃ + 3 S + 6 NO₂ + 6 H₂O

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Balance the following net ionic equation using the half reaction method (in acidic solution) . What is the sum of the coefficients for the balanced reaction? MnO₄^- + SO₃^2- $\rightarrow$ Mn²⁺ + SO₄^2-

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Balance the following half reaction in acidic solution. NO₃^? ? NO

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3 e^? + 4 H⁺ ...
View Answer

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In the redox reaction: BaSO₄ + 4 C $\rightarrow$ BaS + 4 CO, the element reduced is ________.

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A

Balance the following half reaction in basic solution. S^2? ? SO₃^2?

Correct Answer
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6 OH^? + S^2? ?...
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In the redox reaction: 4 Cr + 3 O₂ + 12 HBr $\rightarrow$ 4 CrBr₃ + 6 H₂O the change in oxidation number for O is from ________.

Correct Answer
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C

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Indicate the missing words (or phrases) in the following definition: "An oxidation number is the that an atom when the electrons in each bond it is participating in are assigned to the electronegative of the two atoms involved in the bond."

Correct Answer
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B

Determine the oxidation number of C in NaHCO₃.

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The oxidation number of Cr in K₂Cr₂O₇ is ________.

Correct Answer
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When the half-reaction: MnO₄^- $\rightarrow$ Mn²⁺ (acidic solution) is correctly balanced, ________.

Correct Answer
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