Deck 6: Oxidation-Reduction Reactions

Question 1

What is the oxidation number of sulfur in the S₂O₈² ion?

A)-2
B)+1
C)+3
D)+5
E)+7

Answer 1

+7

Question 2

What is the oxidation number of sodium in Na₂O₂?

A)-2
B)-1
C)+1
D)+2
E)+4

Answer 2

+1

Question 3

What is the oxidation number of boron in Na₂B₄O₇?

A)-3
B)+1
C)+5
D)+3
E)+6

Answer 3

+3

Question 4

What is the oxidation number of cobalt in Co₂(SO₄)₃?

A)+3
B)+6
C)+9
D)+15
E)+30

Question 5

What is the oxidation number of sulfur in Rb₂S₂O₄?

A)-2
B)+1
C)+3
D)+5
E)+6

Question 6

What is the oxidation number of carbon in K₂C₂O₄?

A)0
B)-4
C)+3
D)+4
E)+6

Question 7

What is the oxidation number of vanadium in (NH₄)₃VO₄?

A)+2
B)+3
C)+5
D)+6
E)+7

Question 8

What is the oxidation number of nitrogen in (NH₄)₂SO₄?

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

Question 9

What is the oxidation number of each Cu atom in [Cu₂Cl₆]^2-?

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

Question 10

What is the oxidation number of the arsenic atom in the AsO₄³ ion?

A)+1
B)+3
C)+4
D)+5
E)+6

Question 11

Which statement is true concerning an oxidation-reduction reaction?

A)The reactant which is reduced is the reducing agent.
B)The reactant which is oxidized is the reducing agent.
C)The reactant which gains electrons is the reducing agent.
D)The reactant which loses electrons is the oxidizing agent.
E)None of the statements, A-D, is true.

Question 12

Which statement is true concerning an oxidation-reduction reaction?

A)The reactant which is reduced is the oxidizing agent.
B)The reactant which is oxidized is the oxidizing reagent.
C)The reactant which gains electrons is the reducing agent.
D)The reactant which loses electrons is the oxidizing agent.
E)None of the statements, A-D, is true.

Question 13

In a chemical reaction, one of the reactants is MnO₂. It is transformed into MnSO₄. What is the change in the oxidation number of the manganese?

A)There is no change in oxidation number.
B)The oxidation number increases by one unit.
C)The oxidation number increases by two units.
D)The oxidation number decreases by one unit.
E)The oxidation number decreases by two units.

Question 14

The CrO₄^2- ion was involved in a chemical reaction, during which it is transformed into Cr³⁺ ions. What is the change in oxidation number of the chromium atom?

A)The oxidation number increases by 5 units.
B)The oxidation number decreases by 5 units.
C)The oxidation number increases by 1 unit.
D)The oxidation number decreases by 3 units.
E)The oxidation number decrease by 4 units.

Question 15

Which of the following involves oxidation?

A)Ba²⁺(aq)+ CrO₄^2-(aq) $\rarr$ BaCrO₄(s)
B)2 H⁺(aq)+ CO₃^2-(aq) $\rarr$ H₂O(l)+ CO₂(g)
C)Fe³⁺(aq) $\rarr$ Fe²⁺(aq)
D)MnO₂(s) $\rarr$ MnO₄^-(aq)
E)2 CrO₄^2-(aq)+ 2 H⁺(aq) $\rarr$ Cr₂O₇^2-(aq)+ H₂O(l)

Question 16

Which of the following involves reduction?

A)Ba²⁺(aq)+ CrO₄^2-(aq) $\rarr$ BaCrO₄(s)
B)2 H⁺(aq)+ CO₃^2-(aq) $\rarr$ H₂O(l)+ CO₂(g)
C)CrO₄^2-(aq) $\rarr$ Cr³⁺(aq)
D)MnO₂(s) $\rarr$ MnO₄^-(aq)
E)2 CrO₄^2-(aq)+ 2 H⁺(aq) $\rarr$ Cr₂O₇^2-(aq)+ H₂O(l)

Question 17

Which of the following involves oxidation?

A)Ca²⁺(aq)+ CO₃^2-(aq) $\rarr$ CaCO₃(s)
B)2 H⁺(aq)+ SO₃^2-(aq) $\rarr$ H₂O(l)+ SO₂(g)
C)VO₄^3-(aq) $\rarr$ VO²⁺(aq)
D)CrO₂^- (aq) $\rarr$ CrO₄^2-(aq)
E)2 S₂O₇^2-(aq)+ H₂O(l) $\rarr$ 2 SO₄^2-(aq)+ 2 H⁺(aq)

Question 18

Which of the following involves reduction?

A)Ca²⁺(aq)+ CO₃^2-(aq) $\rarr$ CaCO₃(s)
B)2 H⁺(aq)+ SO₃^2-(aq) $\rarr$ H₂O(l)+ SO₂(g)
C)VO₄^3-(aq) $\rarr$ VO²⁺(aq)
D)CrO₂^- (aq) $\rarr$ CrO₄^2-(aq)
E)2 S₂O₇^2-(aq)+ H₂O(l) $\rarr$ 2 SO₄^2-(aq)+ 2 H⁺(aq)

Question 19

What is the change in the oxidation number of chromium in the following? K₂Cr₂O₇ s Cr₂(SO₄)₃

A)increase by three units
B)increase by four units
C)decrease by two units
D)decrease by three units
E)decrease by four units

Question 20

What is the change in the oxidation number of carbon in the following?
CO $\rarr$ CO₂

A)increase by two units
B)increase by three units
C)increase by four units
D)decrease by three units
E)decrease by four units

Question 21

What is the change in the oxidation number of nitrogen in the following?
HNO₃ $\rarr$ NO

A)increase by three units
B)increase by four units
C)decrease by two units
D)decrease by three units
E)decrease by four units

Question 22

What is the change in the oxidation number of manganese in the following? KMnO₄ $\rarr$ MnSO₄

A)increase by two units
B)increase by three units
C)decrease by four units
D)decrease by five units
E)decrease by six units

Question 23

What is the change in the oxidation number of sulfur in the following?
K₂SO₃ $\rarr$ K₂SO₄

A)decrease by three units
B)decrease by four units
C)increase by two units
D)increase by three units
E)increase by four units

Question 24

What is the change in the oxidation number of iodine in the following?
KI $\rarr$ KIO₃

A)decrease by three units
B)decrease by four units
C)increase by six units
D)increase by five units
E)increase by four units

Question 25

What is the change in the oxidation number of carbon in the following? K₂C₂O₄ $\rarr$ K₂CO₃

A)decrease by one unit
B)decrease by two units
C)decrease by three units
D)increase by one unit
E)increase by two units

Question 26

In the equation, C₄H₁₀(l)+ Cr₂O₇^2-(aq) + H⁺(aq) $\rarr$ H₆C₄O₄(s)+ Cr³⁺(aq)+ H₂O(l), the change in the oxidation number of the chromium atom is

A)a decrease by six units.
B)a decrease by three units.
C)an increase by three units.
D)an increase by five units.
E)an increase by eight units.

Question 27

In the equation, CrO₄^2-(aq) + H₂O(l) $\rarr$ CrO₂^-(aq)+ OH^-(aq), the change in the oxidation number of the chromium atom is

A)decrease by six units.
B)decrease by three units.
C)increase by three units.
D)increase by five units.
E)increase by eight units.

Question 28

The sulfite ion (SO₃^2-)was involved in a chemical reaction in which it underwent oxidation. Based on the change in oxidation numbers, which of the species listed below is a possible oxidation product of the reaction?

A)S₂O₃ ^2-(aq)
B)SO₂(g)
C)S^2-(aq)
D)S(s)
E)SO₄^2-(aq)

Question 29

The nitrogen molecule, (N₂), was involved in a chemical reaction in which it underwent reduction. Based on the change in oxidation numbers, which of the species listed below is a possible product of the reaction?

A)N₂H₄
B)NO
C)NO₂^-
D)NO₂
E)NO₃^-

Question 30

The ClO₂ molecule was involved in a chemical reaction in which it underwent oxidation. Based on the change in oxidation numbers, which of the species listed below is a possible product of the reaction?

A)ClO^-
B)Cl^-
C)ClO₂^-
D)Cl₂
E)ClO₃^-

Question 31

The NO molecule underwent oxidation during a chemical reaction. Which one of the species listed below is a possible product of the reaction?

A)N₂H₄
B)NH₃
C)N₂
D)NO₂^-
E)NH₂OH

Question 32

The following unbalanced equation describes the production of metallic iron: Fe₂O₃ + C $\rarr$ Fe + CO₂ What is the change in oxidation number for the carbon atom?

A)decreases by 1
B)increases by 2
C)increases by 3
D)increases by 4
E)decreases by 5

Question 33

Given the following chemical equation: SiO₂ + CaCO₃ $\rarr$ CaSiO₃ + CO₂ What is the change in oxidation number for silicon atom?

A)There is no change.
B)decreases by 1
C)increases by 2
D)decreases by 3
E)increases by 4

Question 34

Consider the redox equation below: C₄H₁₀(g)+ Cr₂O₇²(aq)+ H⁺(aq) $\rarr$ H₆C₄O₄(aq)+ Cr³⁺(aq)+ H₂O(l)The reducing agent is

A)C₄H₁₀(g)
B)Cr₂O₇²(aq)
C)H⁺(aq)
D)H₆C₄O₄(aq)
E)Cr³⁺(aq)

Question 35

Consider the unbalanced redox equation , C₄H₁₀(l)+ Cr₂O₇^2-(aq) + H⁺(aq) $\rarr$ H₆C₄O₄(s)+ Cr³⁺(aq)+ H₂O(l)The oxidizing agent is

A)C₄H₁₀(l)
B)Cr₂O₇^2-(aq)
C)H⁺(aq)
D)H₆C₄O₄(s)
E)Cr³⁺(aq)

Question 36

Consider the unbalanced redox equation, VO₄^3-(aq)+ SO₂(g)+ 2 H⁺(aq) $\rarr$ VO²⁺(aq)+ SO₄^2-(aq)+ H₂O(l)The reducing agent is

A)VO₄^3-(aq).
B)VO²⁺(aq).
C)H⁺(aq).
D)SO₂(g).
E)SO₄^2-(aq).

Question 37

Consider the redox equation,
2VO₄^3-(aq)+ SO₂(g)+ 8H⁺(aq) $\rarr$ 2VO²⁺(aq)+ SO₄^2-(aq)+ 4H₂O(l) The oxidizing agent is

A)VO₄^3-(aq)
B)VO²⁺(aq)
C)H⁺(aq)
D)SO₂(g)
E)SO₄^2-(aq)

Question 38

Consider the redox equation,
2VO₄^3-(aq)+ SO₂(g)+ 8H⁺(aq) $\rarr$ 2VO²⁺(aq)+ SO₄^2-(aq)+ 4H₂O(l)
Which of the following is correct?Hint: Write out the oxidation numbers for each element in the equation then compare.

A)VO₄^3-(aq)is the oxidizing agent as the oxidation number of O decreases by 3.
B)VO²⁺(aq)is the reducing agent as the oxidation number of V increases by 1, causing the oxidation number of S to increase by 1 also.
C)H⁺(aq)is the reducing agent, its oxidation number increases from 1 to 2, as it must have lost one electron.
D)VO₄^3-(aq)is the oxidizing agent, as the oxidation number of V decreases by 1, suggesting it must have accepted an electron.
E)SO₄^2-(aq)is the oxidizing agent and the product formed from the reduction of SO₂(g).

Question 39

The following unbalanced equation describes the production of metallic iron: Fe₂O₃ + C $\rarr$ Fe + CO₂ Which is true?Hint: Remember the reducing agent is oxidized and the oxidizing agent is reduced.

A)Fe₂O₃ is the reducing agent, since it is reduced, while C is the oxidizing agent, since it oxidizes Fe₂O₃.
B)Fe₂O₃ is the reducing agent, while Fe is the oxidizing agent, as it oxidizes C to CO₂.
C)Fe is the reducing agent, since it reduces C, while C is the oxidizing agent.
D)Fe₂O₃ is the oxidizing agent, while C is the reducing agent, since it reduces Fe₂O₃.
E)Fe₂O₃ is the reducing agent, while CO₂ is the oxidizing agent.

Question 40

Balance the half-reaction, H₂S $\rarr$ S₈, taking place in acidic media. How many electrons are needed to balance the half-reaction?Hint: Remember the coefficients when balancing half-reactions, and look carefully at the oxidation numbers.

A)12 electrons, left side
B)16 electrons, right side
C)14 electrons, left side
D)6 electrons, right side
E)8 electrons, right side

Question 41

Balance the half-reaction, NO₃ $\rarr$ NH₄⁺, taking place in acidic media. How many electrons are needed to balance the half-reaction?Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)2 electrons, left side
B)3 electrons, right side
C)4 electrons, left side
D)8 electrons, left side
E)8 electrons, right side

Question 42

Balance the half-reaction, Cl₂O₇ $\rarr$ HClO, taking place in acidic media. How many electrons are needed to balance the half-reaction?Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)2 electrons, left side
B)3 electrons, right side
C)12 electrons, left side
D)6 electrons, right side
E)8 electrons, left side

Question 43

Balance the half-reaction, C₂H₆O $\rarr$ HC₂H₃O₂, taking place in acidic media. How many electrons are needed to balance the charge?Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)2 electrons, left side
B)3 electrons, left side
C)4 electrons, right side
D)6 electrons, right side
E)8 electrons, right side

Question 44

Balance the half-reaction, C₈H₁₀ $\rarr$ C₈H₄O₄², taking place in basic media. How many electrons are needed to balance the half-reaction?Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)4 electrons, left side
B)8 electrons, right side
C)8 electrons, left side
D)12 electrons, left side
E)12 electrons, right side

Question 45

Complete the balancing of the following half-reaction, taking place in basic media. How many electrons are needed to balance the half-reaction?
Br(aq) $\rarr$ BrO₃(aq) Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)2 electrons, left side
B)2 electrons, right side
C)4 electrons, right side
D)6 electrons, right side
E)6 electrons, left side

Question 46

Complete the balancing of the following half-reaction, taking place in basic media. How many electrons are needed to balance the half-reaction?
Cr(OH)₄(aq) $\rarr$ CrO₄²(aq)Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)1 electron, on the left side
B)2 electrons, on the right side
C)3 electrons, on the right side
D)3 electrons, on the left side
E)4 electrons, on the right side

Question 47

Complete the balancing of the following half-reaction, taking place in basic media. How many hydroxide ions are needed to balance the half-reaction?Br(aq)s BrO₃(aq)Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)2 hydroxide ions, on the left side
B)4 hydroxide ions, on the left side
C)4 hydroxide ions, on the right side
D)6 hydroxide ions, on the left side
E)6 hydroxide ions, on the right side

Question 48

Complete the balancing of the following half-reaction, taking place in basic media. How many hydroxide ions are needed to balance the half-reaction? Cr(OH)₄(aq) $\rarr$ CrO₄²(aq)Hint: Remember the coefficients when balancing half-reactions and look carefully at the oxidation numbers.

A)1 hydroxide ion, on the left side
B)3 hydroxide ions, on the right side
C)3 hydroxide ions, on the left side
D)4 hydroxide ions, on the left side
E)4 hydroxide ions, on the right side

Question 49

After balancing the following equation for the reaction in acidic media,
Fe²⁺(aq)+ Cr₂O₇²(aq)+ H⁺(aq) $\rarr$ Cr³⁺(aq)+ Fe³⁺(aq)+ H₂O(l)what is the sum of ALL the coefficients in the equation?(Remember to include values of 1 in your summation.)Hint: Start by balancing each half-reaction.

A)6
B)22
C)30
D)32
E)36

Question 50

After balancing the following equation for the reaction in acidic media,
MnO₄^-(aq)+ H₂C₂O₄(aq)+ H⁺(aq) $\rarr$ Mn²⁺(aq)+ CO₂(g)+ H₂O(l)what is the sum of ALL the coefficients in the equation?(Remember to include values of 1 in your summation.)Hint: Start by balancing each half-reaction.

A)29
B)30
C)31
D)32
E)33

Question 51

After balancing the following equation for the reaction in acidic media,
H⁺ + HSO₃^-(aq)+ MnO₄^-(aq) $\rarr$ MnO₂(s)+ HSO₄^-(aq)+ H₂O what is the sum of ALL the coefficients in the equation? (Remember to include values of 1 in your summation.)Hint: Start by balancing each half-reaction.

A)7
B)9
C)13
D)15
E)19

Question 52

After balancing the following equation for the reaction in basic media,
OH^- + Bi₂O₃(s)+ OCl^-(aq) $\rarr$ Cl^-(aq)+ BiO₃^-(aq)+ H₂O what is the sum of ALL the coefficients in the equation? (Remember to include values of 1 in your summation.)Hint: Start by balancing each half-reaction.

A)6
B)8
C)9
D)10
E)14

Question 53

After balancing the following equation for the reaction in basic media,
H₂O + CrO₄^2-(aq)+ Br^-(aq) $\rarr$ CrO₂^-(aq)+ BrO₃^-(aq)+ OH^- what is the sum of ALL the coefficients in the equation? (Remember to include values of 1 in your summation.)Hint: Start by balancing each half-reaction.

A)6
B)8
C)9
D)10
E)14

Question 54

After balancing the following equation for the reaction in basic media,
I^-(aq)+ MnO₄^-(aq) $\rarr$ I₂(aq)+ MnO₂(s)what is the sum of ALL the coefficients in the equation? (Remember to include values of 1 in your summation.)Hint: Start by balancing each half-reaction.

A)6
B)13
C)17
D)25
E)28

Question 55

Zinc metal reacts with perchloric acid solution to produce aqueous zinc perchlorate and hydrogen gas, which escapes. The species being oxidized in this reaction is

A)HClO₄(aq).
B)H₂(g).
C)Zn²⁺(aq).
D)Zn(s).
E)Zn(ClO₄)₂(aq).

Question 56

Sodium bicarbonate, (NaHCO₃), in solution reacts with hydrochloric acid solution to produce aqueous sodium chloride, carbon dioxide gas, and water. The species being reduced in this reaction is Hint: Oxidation is a loss of electrons and reduction is a gain of electrons.

A)HCO₃^- (aq).
B)CO₂(g).
C)HCl(aq).
D)Cl^-(aq).
E)none of the above.

Question 57

Zinc metal reacts with nitric acid solution to produce aqueous zinc nitrate, ammonium nitrate (in solution), and water. The species being oxidized in this reaction is

A)HNO₃(aq).
B)NH₄⁺(aq).
C)Zn²⁺(aq).
D)Zn(s).
E)Zn(NO₃)₂(aq).

Question 58

Zinc metal reacts with nitric acid solution to produce zinc nitrate (in solution), ammonium nitrate (in solution), and water. The species being reduced in this reaction is

A)HNO₃(aq).
B)NH₄⁺(aq).
C)Zn²⁺(aq).
D)Zn(s).
E)Zn(NO₃)₂(aq).

Question 59

Nitric acid reacts with copper metal according to the unbalanced equation,
Cu(s)+ HNO₃(aq) $\rarr$ Cu(NO₃)₂(aq)+ NO₂(g)+ H₂O Which is correct?

A)The nitrate ion is the reducing agent, and it is reduced to water.
B)The product of the reduction reaction is NO₂.
C)The product of the reduction reaction is Cu(NO₃)₂.
D)Copper is the oxidizing agent, and it is reduced to Cu(NO₃)₂.
E)Both water and copper are reduced.

Question 60

Magnesium metal reacts with aqueous sulfuric acid solution to produce aqueous magnesium sulfate and hydrogen gas. In the course of the reaction, which element undergoes an increase in oxidation number?

A)hydrogen
B)magnesium
C)oxygen
D)sulfur
E)both magnesium and hydrogen

Question 61

The reaction of potassium metal and which one of the following ions could be used to produce the most electrical current, per mole of potassium? Hint: Look at the activity series.

A)Ag⁺
B)H⁺
C)Mn⁺
D)Sr²⁺
E)Rb⁺

Question 62

The most reactive metals are those of

A)Group IA (Group 1).
B)Group IIA (Group 2).
C)Group IIIA (Group 13).
D)Group IB (Group 11).
E)Group IIB (Group 12).

Question 63

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation most readily?

A)Ag
B)Al
C)Cu
D)Cd
E)Zn

Question 64

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation most readily?

A)Mg
B)Al
C)Cu
D)Cd
E)Zn

Question 65

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation least readily?

A)Mg
B)Al
C)Cu
D)Cd
E)Zn

Question 66

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation least readily?

A)Ag
B)Al
C)Cu
D)Cd
E)Zn

Question 67

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would react most readily with a 0.10 M aqueous solution of hydrofluoric acid?

A)Ag
B)Sn
C)Cu
D)Cd
E)Zn

Question 68

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would react most readily with a 0.10 M aqueous solution of hydrochloric acid?

A)Au
B)Sn
C)Cu
D)Al
E)Mg

Question 69

Three metallic elements, copper, gold and zinc, can be distinguished from one another on the basis of how they react with two strong acids, HNO₃(aq)and HCl(aq). Which set below, using the abbreviations R (for reaction occurs)and NR (for no reaction)correctly describes what occurs?

Question 70

Three metallic elements, copper, magnesium and gold, can be distinguished from one another on the basis of how they react with two strong acids, HNO₃(aq)and HCl(aq). Which set below, using the abbreviations R (for reaction occurs)and NR (no reaction)correctly describes what occurs?

Question 71

The least reactive metals are those of

A)Group IA (Group 1)
B)Group IIA (Group 2)
C)Group IIIA (Group 13)
D)Group IB (Group 11)
E)Group IIB (Group 12)

Question 72

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below does not occur spontaneously upon mixing the reagents shown?

A)Cd(s)+ Al³⁺(aq) $\rarr$ Cd²⁺(aq)+ Al(s)
B)Cd(s)+ Cu²⁺(aq) $\rarr$ Cd²⁺(aq)+ Cu(s)
C)Zn(s)+ Cu²⁺(aq) $\rarr$ Zn²⁺(aq)+ Cu(s)
D)Al(s)+ Ag⁺(aq) $\rarr$ Al³⁺(aq)+ Ag(s)
E)Cu(s)+ Au³⁺(aq) $\rarr$ Cu²⁺(aq)+ Au(s)

Question 73

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below does not occur spontaneously upon mixing the reagents shown?

A)Al(s)+ Cd²⁺(aq) $\rarr$ Al³⁺(aq)+ Cd(s)
B)Mg(s)+ Cu²⁺(aq) $\rarr$ Mg²⁺(aq)+ Cu(s)
C)Zn(s)+ Ag⁺(aq) $\rarr$ Zn²⁺(aq)+ Ag(s)
D)Zn(s)+ Al³⁺(aq) $\rarr$ Zn²⁺(aq)+ Al(s)
E)Na(s)+ Au³⁺(aq) $\rarr$ Na⁺(aq)+ Au(s)

Question 74

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below occurs spontaneously upon mixing the reagents shown?

A)Sn(s)+ Zn²⁺(aq) $\rarr$ Sn²⁺(aq)+ Zn(s)
B)Ag(s)+ Mg²⁺(aq) $\rarr$ Ag⁺(aq)+ Mg(s)
C)Zn(s)+ Au³⁺(aq) $\rarr$ Zn²⁺(aq)+ Au(s)
D)Ag(s)+ Zn²⁺(aq) $\rarr$ Ag⁺(aq)+ Zn(s)
E)Sn(s)+ Al³⁺(aq) $\rarr$ Sn²⁺(aq)+ Al(s)

Question 75

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below occurs spontaneously upon mixing the reagents shown?

A)Ag(s)+ Zn²⁺(aq) $\rarr$ Ag⁺(aq)+ Zn(s)
B)Ag(s)+ Cd²⁺(aq) $\rarr$ Ag⁺(aq)+ Cd(s)
C)Zn(s)+ Mg²⁺(aq) $\rarr$ Zn²⁺(aq)+ Mg(s)
D)Ag(s)+ Mg²⁺(aq) $\rarr$ Ag⁺(aq)+ Mg(s)
E)Sn(s)+ Cu²⁺(aq) $\rarr$ Sn²⁺(aq)+ Cu(s)

Question 76

Which element would react most rapidly with water?

A)Ag
B)K
C)Cu
D)Na
E)Rb

Question 77

Which element would react most rapidly with water?

A)K
B)Cd
C)Cs
D)Na
E)Zn

Question 78

Which element would be the least likely to react, if at all, with water?

A)Ca
B)Al
C)Cu
D)Na
E)Zn

Question 79

A partial activity series is: Au < Ag < Cu < H₂ < Sn < Cd < Fe < Mn. Which combination of metals is likely to be produced when each of the following compounds is made to react with solid Cd metal:Cd(NO₃)₂(aq); Fe(NO₃)₂(aq); HNO₃(aq); Cu(NO₃)₂(aq); Sn(NO₃)₂(aq)? Hint: In the partial activity series above, Mn is the most reactive and Au is the least reactive.

A)Cd, Fe
B)Cu, Cd
C)Cu, Fe
D)Fe, Sn
E)Sn, Cu

Question 80

A partial activity series is: Au < Ag < Cu < H₂ < Sn < Cd < Fe < Mn. Which metal(s)is/are NOT likely to be produced when each of the following compounds is made to react with Cd metal:Cd(NO₃)₂(aq); Fe(NO₃)₂(aq); HNO₃(aq); Cu(NO₃)₂(aq); Sn(NO₃)₂(aq); AgNO₃(aq)? Hint: In the partial activity series above, Mn is the most reactive and Au is the least reactive.

A)Cu, Sn
B)Sn, Ag
C)Cu
D)Fe, Cd
E)Ag, Cu