Question 1

What is the oxidation state of iron in Fe2(CO3)3?

Accepted Answer

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

Question 2

Which of the following reactions does not involve oxidation-reduction?

Accepted Answer

A)  CH4 + 3O2 $\rightarrow$2H2O + CO4 
B)  Zn + 2HCl $\rightarrow$ZnCl2 + H2 
C)  2Na + 2H2O $\rightarrow$2NaOH + H2 
D)  MnO2 + 4HCl $\rightarrow$Cl2 + 2H2O + MnCl2 
E)  All are oxidation-reduction reactions. 
A)  CH4 + 3O2 $\rightarrow$2H2O + CO4 
B)  Zn + 2HCl $\rightarrow$ZnCl2 + H2 
C)  2Na + 2H2O $\rightarrow$2NaOH + H2 
D)  MnO2 + 4HCl $\rightarrow$Cl2 + 2H2O + MnCl2 
E)  All are oxidation-reduction reactions. E

Question 3

The following reaction occurs in aqueous acid solution: NO3- + I- $\rightarrow$ IO3- + NO2
The oxidation state of iodine in IO3- is

Accepted Answer

A)  0 
B)  +3 
C)  -3 
D)  +5 
E)  -5 
A)  0 
B)  +3 
C)  -3 
D)  +5 
E)  -5 D

Question 4

In the reaction shown below, which species is oxidized? 2KI + F2 $\rightarrow$ 2KF + I2

Accepted Answer

A)  I- 
B)  K+ 
C)  F2 
D)  F- 
E)  I2 
A)  I- 
B)  K+ 
C)  F2 
D)  F- 
E)  I2

Question 5

In the balanced equation for the following reaction (in acidic solution) ClO3- + Fe2+ $\rightarrow$ Cl- + Fe3+
The coefficient of Fe2+ is

Accepted Answer

A)  1 
B)  6 
C)  2 
D)  8 
E)  3 
A)  1 
B)  6 
C)  2 
D)  8 
E)  3

Question 6

In the reaction P4(s) + 10Cl2(g) $\rightarrow$ 4PCl5(s), phosphorus is ______________.

Accepted Answer

A)  reduced 
B)  electrolyzed 
C)  synthesized 
D)  oxidized 
E)  none of these 
A)  reduced 
B)  electrolyzed 
C)  synthesized 
D)  oxidized 
E)  none of these

Question 7

When the following reaction is balanced in acidic solution, what is the coefficient of water? Zn(s) + NO3-(aq)$\rightarrow$Zn2+(aq) + NH4+(aq)

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  none of these 
A)  1 
B)  2 
C)  3 
D)  4 
E)  none of these

Question 8

Balance the following half-reaction that occurs in acidic solution:
MnO4-(aq) $\rightarrow$Mn2+(aq)

Accepted Answer

MnO₄^-(aq

Question 9

The oxidation state of phosphorus in Mg3(PO4)2 is

Accepted Answer

A)  0 
B)  +2 
C)  +4 
D)  +5 
E)  +6 
A)  0 
B)  +2 
C)  +4 
D)  +5 
E)  +6

Question 10

Balance the following reaction that takes place in acidic solution:
Mg(s) + HCl(aq) $\rightarrow$MgCl2(aq) + H2(g)

Accepted Answer

Mg(s) + 2HCl(aq) @#LAT-DLM&MgC

Question 11

The oxidation state of titanium in TiO is

Accepted Answer

A)  +2 
B)  +1 
C)  0 
D)  -1 
E)  -2 
A)  +2 
B)  +1 
C)  0 
D)  -1 
E)  -2

Question 12

The oxidation state of sulfur in H2SO4 is

Accepted Answer

A)  +6 
B)  +4 
C)  +2 
D)  +8 
E)  0 
A)  +6 
B)  +4 
C)  +2 
D)  +8 
E)  0

Question 13

Answer the following questions that refer to the unbalanced reaction shown below as it occurs in acidic solution:
_______ CrS1U1B12S1U1B0OS1U1B17S1U1B0S1U1P12S1S1P0S1U1P1-S1S1P0 (aq) + _______ IS1U1P1-S1S1P0(aq)$\rightarrow$_______ CrS1U1P13+S1S1P0(aq) + _______ IS1U1B12S1U1B0(s)
-Determine the coefficient for the Cr3+ ions.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  6 
E)  7 
A)  1 
B)  2 
C)  3 
D)  6 
E)  7

Question 14

In reacting, metal atoms characteristically

Accepted Answer

A)  become anions 
B)  lose electrons 
C)  decrease in oxidation state 
D)  form covalent bonds 
A)  become anions 
B)  lose electrons 
C)  decrease in oxidation state 
D)  form covalent bonds

Question 15

Which of the following battery types is commonly used in an automobile?

Accepted Answer

A)  dry cell 
B)  alkaline dry cell 
C)  lead storage 
D)  mercury cell 
E)  nickel-cadmium 
A)  dry cell 
B)  alkaline dry cell 
C)  lead storage 
D)  mercury cell 
E)  nickel-cadmium

Question 16

Which of the following statements is not true of electrolysis?

Accepted Answer

A)  Electrolysis is a process where electrical energy is used to produce a chemical change. 
B)  Electrolysis involves forcing a current through a cell to produce a change that would otherwise not occur. 
C)  The electrolysis of water produces hydrogen gas and oxygen gas. 
D)  Electrolysis is used to recharge a lead storage battery. 
E)  None of these; that is, all these statements are true. 
A)  Electrolysis is a process where electrical energy is used to produce a chemical change. 
B)  Electrolysis involves forcing a current through a cell to produce a change that would otherwise not occur. 
C)  The electrolysis of water produces hydrogen gas and oxygen gas. 
D)  Electrolysis is used to recharge a lead storage battery. 
E)  None of these; that is, all these statements are true.

Question 17

In the reaction C(s) + O2(g) $\rightarrow$ CO2(g), carbon is ______________.

Accepted Answer

A)  reduced 
B)  electrolyzed 
C)  synthesized 
D)  oxidized 
E)  none of these 
A)  reduced 
B)  electrolyzed 
C)  synthesized 
D)  oxidized 
E)  none of these

Question 18

Reduction is a gain of electrons.

Accepted Answer

A) True 
 B)False

Question 19

In the reaction 2Sr(s) + F2(g) $\rightarrow$ 2SrF(s), the fluorine is ________.

Accepted Answer

A)  reduced 
B)  electrolyzed 
C)  galvanized 
D)  oxidized 
E)  none of these 
A)  reduced 
B)  electrolyzed 
C)  galvanized 
D)  oxidized 
E)  none of these

Question 20

The oxidation state of Rb in any compound is

Accepted Answer

A)  +2 
B)  +1 
C)  0 
D)  -1 
E)  -2 
A)  +2 
B)  +1 
C)  0 
D)  -1 
E)  -2

Exam 18: Oxidation-Reduction Reactions and Electrochemistry

What is the oxidation state of iron in Fe2(CO3)3?

Which of the following reactions does not involve oxidation-reduction?

The following reaction occurs in aqueous acid solution: NO3- + I- →\rightarrow→ IO3- + NO2 The oxidation state of iodine in IO3- is

In the reaction shown below, which species is oxidized? 2KI + F2 →\rightarrow→ 2KF + I2

In the balanced equation for the following reaction (in acidic solution) ClO3- + Fe2+ →\rightarrow→ Cl- + Fe3+ The coefficient of Fe2+ is

In the reaction P4(s) + 10Cl2(g) →\rightarrow→ 4PCl5(s), phosphorus is ______________.

When the following reaction is balanced in acidic solution, what is the coefficient of water? Zn(s) + NO3-(aq) →\rightarrow→ Zn2+(aq) + NH4+(aq)

Balance the following half-reaction that occurs in acidic solution: MnO4-(aq) →\rightarrow→ Mn2+(aq)

The oxidation state of phosphorus in Mg3(PO4)2 is

Balance the following reaction that takes place in acidic solution: Mg(s) + HCl(aq) →\rightarrow→ MgCl2(aq) + H2(g)

The oxidation state of titanium in TiO is

The oxidation state of sulfur in H2SO4 is

Answer the following questions that refer to the unbalanced reaction shown below as it occurs in acidic solution: _______ Cr2O72- (aq) + _______ I-(aq) →\rightarrow→ _______ Cr3+(aq) + _______ I2(s) -Determine the coefficient for the Cr3+ ions.

In reacting, metal atoms characteristically

Which of the following battery types is commonly used in an automobile?

Which of the following statements is not true of electrolysis?

In the reaction C(s) + O2(g) →\rightarrow→ CO2(g), carbon is ______________.

Reduction is a gain of electrons.

In the reaction 2Sr(s) + F2(g) →\rightarrow→ 2SrF(s), the fluorine is ________.

The oxidation state of Rb in any compound is

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What is the oxidation state of iron in Fe₂(CO₃)₃?

The following reaction occurs in aqueous acid solution: NO₃^- + I^- $\rightarrow$ IO₃^- + NO₂ The oxidation state of iodine in IO₃^- is

In the reaction shown below, which species is oxidized? 2KI + F₂ $\rightarrow$ 2KF + I₂

In the balanced equation for the following reaction (in acidic solution) ClO₃^- + Fe²⁺ $\rightarrow$ Cl^- + Fe³⁺ The coefficient of Fe²⁺ is

In the reaction P₄(s) + 10Cl₂(g) $\rightarrow$ 4PCl₅(s), phosphorus is ______________.

When the following reaction is balanced in acidic solution, what is the coefficient of water? Zn(s) + NO₃^-(aq) $\rightarrow$ Zn²⁺(aq) + NH₄⁺(aq)

Balance the following half-reaction that occurs in acidic solution: MnO₄^-(aq) $\rightarrow$ Mn²⁺(aq)

The oxidation state of phosphorus in Mg₃(PO₄)₂ is

Balance the following reaction that takes place in acidic solution: Mg(s) + HCl(aq) $\rightarrow$ MgCl₂(aq) + H₂(g)

The oxidation state of sulfur in H₂SO₄ is

Answer the following questions that refer to the unbalanced reaction shown below as it occurs in acidic solution: ___ Cr₂O₇²^- (aq) + _ I^-(aq) $\rightarrow$ _ Cr³⁺(aq) + ___ I₂(s) -Determine the coefficient for the Cr³⁺ ions.

In the reaction C(s) + O₂(g) $\rightarrow$ CO₂(g), carbon is ______________.

In the reaction 2Sr(s) + F₂(g) $\rightarrow$ 2SrF(s), the fluorine is ________.