Question 1

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

Accepted Answer

An atom or ion loses electrons.

Question 2

In the reaction $$ \mathrm{2Fe$$^{2+}$$ + C \rightarrow 2Fe + CO_2$} $$, which element is oxidized?

Accepted Answer

Carbon

Question 3

Which of the following is NOT a characteristic of reduction?

Accepted Answer

Gain of oxygen

Question 4

Assign the oxidation number to sulfur in $$ \mathrm{SO_2$} .$$

Accepted Answer

$$+4$$

Question 5

Which of the following statements about oxidizing and reducing agents is correct?

Accepted Answer

The oxidizing agent is reduced during the reaction.

Question 6

In the reaction $$ \mathrm{Zn(s) + $$CuSO_4$$(aq) \rightarrow $$ZnSO_4$$(aq) + Cu(s)} $$, which species acts as the reducing agent?

Accepted Answer

Zn

Question 7

Which process is an example of reduction?

Accepted Answer

Gain of hydrogen

Question 8

What is the oxidation number of nitrogen in $$ \mathrm{NO_3$^-} $$?

Accepted Answer

$$+5$$

Question 9

Which of the following is a common real-world application of a redox reaction?

Accepted Answer

Rusting of iron

Question 10

In a galvanic cell, where does oxidation occur?

Accepted Answer

At the anode

Question 11

Which of the following best describes what happens to $$ \mathrm{Ag^+} $$ ions when a copper wire is placed in a silver nitrate solution?

Accepted Answer

They are reduced to silver metal.

Question 12

Which of the following is the correct balanced half-reaction for the reduction of $$ \mathrm{Fe$$^{3+}$$}  to$$ $$ \mathrm{Fe$$^{2+}$$} $$?

Accepted Answer

$$ \mathrm{Fe$$^{3+}$$ + e^- \rightarrow Fe$$^{2+}$$} $$

Question 13

Which of the following is a common oxidizing agent used in household disinfectants?

Accepted Answer

Hydrogen peroxide ($$ \mathrm{H_2O_2} )$$

Question 14

During the corrosion of silver, which substance acts as the reducing agent when aluminum is used to restore the shine?

Accepted Answer

Aluminum

Question 15

Which element is oxidized during photosynthesis?

Accepted Answer

Oxygen

Question 16

In the reaction $$ \mathrm{2Mg + O_2$ \rightarrow 2MgO} $$, what is the oxidation number of magnesium in the product?

Accepted Answer

$$+2$$

Question 17

Which of the following statements about the role of oxygen in redox reactions is correct?

Accepted Answer

Oxygen is commonly an oxidizing agent.

Question 18

Which of the following is the correct overall balanced equation for the reaction of zinc with oxygen to form zinc oxide?

Accepted Answer

$$ \mathrm{2Zn + O_2$ \rightarrow 2ZnO} $$

Question 19

Which of the following is a real-life application of a redox reaction involving silver?

Accepted Answer

Photochromic lenses darkening in sunlight

Question 20

Which of the following best describes what happens at the cathode in an electrochemical cell?

Accepted Answer

Reduction occurs and electrons are gained.

Oxidation and Reduction: Introductory Chemistry Study Guide

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