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• Multiple Choice

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• Extended Response

Standardized Test PreparationChapter 19

Standardized Test Preparation

Multiple Choice

1. In the following reaction, which species is reduced?

A. K

B. Br2

C. All of the above

D. None of the above

+22K + Br 2K + 2Br –

Chapter 19

1. In the following reaction, which species is reduced?

A. K

B. Br2

C. All of the above


+22K + Br 2K + 2Br –

Chapter 19 Standardized Test Preparation

Multiple Choice

2. The oxidation number of the sulfur atom in the

A. +2.

B. −2.

C. +6.

D. +4.

24SO ion is–


Multiple Choice

3. A half-reaction

A. involves a change in the oxidation state of an element.

B. always contains H2O molecules.

C. always contains H+ ions.

D. All of the above


Multiple Choice

4. In the following reaction, which is the oxidizing agent?

A. AgNO2

B. Cl2C. KOH

D. KCl

2 2 3 2AgNO + Cl + 2KOH AgNO + 2KCl + H O


Multiple Choice

5. What are the oxidation states (in increasing order) of the element that undergoes disproportionation in the following reaction:

A. −1, 0, +2

B. −1, 0, +1

C. −2, −1, 0


2 2Cl + H O HCl + HOCl


Multiple Choice

6. Which reaction is a redox reaction?

A.

B.

C.

D.

2 3 3 2Al O + 6HCl 2AlCl + 3H O

23 2 3 22HCO CO + CO + H O– –

4 2 2 3SiBr + 3H O H SiO + 4HBr

2 2 3H O + PbO + NaOH + KCl KClO + NaPb(OH)


Multiple Choice

2 2 3H O + PbO + NaOH + KCl KClO + NaPb(OH)


Multiple Choice

6. Which reaction is a redox reaction?

A.

B.

C.

D.

2 3 3 2Al O + 6HCl 2AlCl + 3H O

23 2 3 22HCO CO + CO + H O– –

4 2 2 3SiBr + 3H O H SiO + 4HBr

7. Arrange the following in order of increasing oxidation number of the sulfur atom:

A.

B.

C.

D.

2 22 3 4 6 4 2S O , S O , HSO , and H S.– – –

2 22 2 3 4 6 4H S, S O , S O , HSO– – –

2 22 3 2 4 6 4S O , H S, S O , HSO– – –

2 22 2 3 4 4 6H S, S O , HSO , S O– – –

2 24 2 3 4 6 2HSO , S O , S O , H S– – –


Multiple Choice

2 22 2 3 4 6 4H S, S O , S O , HSO– – –


Multiple Choice

7. Arrange the following in order of increasing oxidation number of the sulfur atom:

A.

B.

C.

D.

2 22 3 2 4 6 4S O , H S, S O , HSO– – –

2 22 2 3 4 4 6H S, S O , HSO , S O– – –

2 24 2 3 4 6 2HSO , S O , S O , H S– – –

2 22 3 4 6 4 2S O , S O , HSO , and H S.– – –

8. Which answer contains the correct information about the following reaction:

A. This reaction is a decomposition reaction and not a redox reaction.

B. This reaction is a redox reaction in which the lead is reduced and the oxygen is oxidized.

C. This reaction is a disproportionation reaction.

D. This reaction is a redox reaction in which the nitrogen is reduced and the oxygen is oxidized.

3 2 2 22Pb(NO ) 2PbO + 4NO + O


Multiple Choice


Multiple Choice

8. Which answer contains the correct information about the following reaction:

A. This reaction is a decomposition reaction and not a redox reaction.

B. This reaction is a redox reaction in which the lead is reduced and the oxygen is oxidized.

C. This reaction is a disproportionation reaction.

D. This reaction is a redox reaction in which the nitrogen is reduced and the oxygen is oxidized.

3 2 2 22Pb(NO ) 2PbO + 4NO + O

9. Determine the oxidation numbers for Cu in the superconductor YBa2Cu3O7.Yttrium (Y) has an oxidation number of +3. (Cu does not have oxidation numbers greater than +3.) Give only integer oxidation numbers.


Short Answer

9. Determine the oxidation numbers for Cu in the superconductor YBa2Cu3O7.Yttrium (Y) has an oxidation number of +3. (Cu does not have oxidation numbers greater than +3.) Give only integer oxidation numbers.

Answer: The oxidation numbers for Y, Ba, and O are +3, +2, and −2, respectively. Therefore, the sum of the oxidation numbers for the three Cu atoms must be +7. Two Cu atoms must have +2 oxidation states, and one Cu atom must have a +3 oxidation state.


Short Answer

10. What is an oxidizing agent?


Short Answer

10. What is an oxidizing agent?

Answer: An oxidizing agent is a species that causes another species to be oxidized in a redox reaction. An oxidizing agent is therefore reduced in a redox reaction.


Short Answer

11. B, F, K, and L are four unknown reducing agents that oxidize to singly charged cations. Using the following information, construct a table showing the relative strengths of the oxidizing and reducing agents. Data: F reduces K+, B+, and L+. B+ oxidizes K and F, but not L.


Extended Response

11. B, F, K, and L are four unknown reducing agents that oxidize to singly charged cations. Using the following information, construct a table showing the relative strengths of the oxidizing and reducing agents. Data: F reduces K+, B+, and L+. B+ oxidizes K and F, but not L.

Answer: Reducing

agentsOxidizingagents

F

K

B

L

F+

K+

B+

L+


Extended Response

12. Balance the equation for the following reaction in basic solution:

Give the balanced equation for each half-reaction and for the overall reaction. Give the oxidizing agent and the reducing agent.

2 3 2ClO KClO + KClO


Extended Response

12. Balance the equation for the following reaction in basic solution:

Give the balanced equation for each half-reaction and for the overall reaction. Give the oxidizing agent and the reducing agent.

Answer:

Oxidation half-reaction:

Reduction half-reaction:

Overall reaction:

This reaction is a disproportionation reaction; therefore, ClO2 is both the reducing agent and the oxidizing agent.

2 3 2ClO KClO + KClO

e2 3 22OH + ClO ClO + + H O– – –

e 2 2ClO + ClO– –

2 3 2 22ClO + 2KOH KClO + KClO + H O


Extended Response

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