Question 1

Which of the following best describes what happens during oxidation in a redox reaction?

Accepted Answer

A substance loses electrons and is oxidized.

Question 2

In the reaction $$ \mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)} $$, which species acts as the reducing agent?

Accepted Answer

$$\mathrm{Zn}$$

Question 3

Which of the following is the correct half-reaction for the reduction of copper(II) ion?

Accepted Answer

$$\mathrm{Cu$$^{2+}$$(aq) + 2e^- \rightarrow Cu(s)}$$

Question 4

Which of the following statements is TRUE regarding oxidizing and reducing agents?

Accepted Answer

The oxidizing agent is reduced by gaining electrons.

Question 5

Consider the reaction: $$\mathrm{2Ag^+ + 2Cl^- \rightarrow 2Ag + Cl_2$}. $$Which reactant is oxidized?

Accepted Answer

$$\mathrm{Cl^-}$$

Question 6

Which of the following is an example of a redox reaction in everyday life?

Accepted Answer

Iron rusting when exposed to air and moisture

Question 7

Given the half-reaction $$\mathrm{Sn(s) \rightarrow Sn$$^{4+}$$(aq) + 4e^-}$$, what process is occurring?

Accepted Answer

Oxidation

Question 8

Which of the following best explains why metals tend to be reducing agents in redox reactions?

Accepted Answer

Metals lose electrons to form positive ions.

Question 9

In the reaction $$\mathrm{Fe$$^{3+}$$(aq) + 1e^- \rightarrow Fe$$^{2+}$$(aq)}$$, what is happening to the iron ion?

Accepted Answer

It is being reduced.

Question 10

Which of the following is the correct identification of the oxidizing agent in the reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$?

Accepted Answer

$$\mathrm{Cu$$^{2+}$$(aq)}$$

Question 11

A silver spoon tarnishes over time due to a redox reaction with sulfur compounds in the air. Which process is occurring to the silver?

Accepted Answer

Silver is being oxidized.

Question 12

Which of the following best describes a 'spectator ion' in a redox reaction?

Accepted Answer

An ion that does not change oxidation state during the reaction.

Question 13

In the reaction $$\mathrm{Cl_2$(g) + 2e^- \rightarrow 2Cl^-(aq)}$$, what is the role of chlorine?

Accepted Answer

Chlorine is being reduced.

Question 14

Which of the following is a correct statement about the relationship between oxidizing and reducing agents?

Accepted Answer

The reducing agent is the substance that is oxidized.

Question 15

A copper roof turns green over time due to exposure to air. What type of chemical process is primarily responsible for this color change?

Accepted Answer

A redox reaction

Question 16

Which of the following best summarizes the mnemonic 'LEO the lion says GER'?

Accepted Answer

Lose electrons oxidize; gain electrons reduce

Question 17

In a redox reaction, which of the following statements is always true?

Accepted Answer

One substance is oxidized and another is reduced.

Question 18

Which of the following is the correct oxidation half-reaction for zinc in the reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$?

Accepted Answer

$$\mathrm{Zn(s) \rightarrow Zn$$^{2+}$$(aq) + 2e^-}$$

Question 19

Which of the following best describes what happens to iron when it rusts?

Accepted Answer

Iron is oxidized by losing electrons.

Question 20

Which of the following is NOT a characteristic of a redox reaction?

Accepted Answer

No change in oxidation state occurs for any element.

Redox Reactions: Oxidation and Reduction in Chemistry

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