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 $$2Fe^{2+} + C$$ \rightarrow 2Fe + $$CO_2$$, which species is the reducing agent?

Accepted Answer

C

Question 3

Which of the following changes indicates that a substance has been reduced?

Accepted Answer

It gains electrons

Question 4

Assign the oxidation number to sulfur in $$SO_2.$$

Accepted Answer

$$+4$$

Question 5

Which of the following is true about the oxidizing agent in a redox reaction?

Accepted Answer

It is the species that is reduced

Question 6

In the reaction $$Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)$$, which element is oxidized?

Accepted Answer

Zn

Question 7

Which of the following is NOT a characteristic of reduction?

Accepted Answer

Gain of oxygen

Question 8

A reaction involves $$2H_2 + O_2$ \rightarrow 2H_2O. $$Which element is oxidized?

Accepted Answer

Hydrogen

Question 9

Which of the following statements about electrochemical cells is correct?

Accepted Answer

Oxidation occurs at the anode

Question 10

In the process of photosynthesis, which element is oxidized?

Accepted Answer

Carbon

Question 11

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

Accepted Answer

The tarnishing of silver

Question 12

What is the oxidation number of nitrogen in $$NO_3$$^-$$?

Accepted Answer

$$+5$$

Question 13

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

Accepted Answer

They are reduced

Question 14

Which of the following is the correct balanced equation for the reaction of magnesium with oxygen?

Accepted Answer

$$2Mg + O_2$ \rightarrow 2MgO$$

Question 15

Which of the following is a common oxidizing agent used in disinfectants and hair bleach?

Accepted Answer

Hydrogen peroxide ($$H_2O_2)$$

Question 16

In the reaction $$2Al + 3Cu$$^{2+}$$ \rightarrow 2Al$$^{3+}$$ + 3Cu$$, which species is the oxidizing agent?

Accepted Answer

$$Cu^{2+}$$

Question 17

Which of the following statements about oxidation numbers is correct?

Accepted Answer

The sum of the oxidation numbers in a neutral compound is zero

Question 18

Which of the following is reduced in the reaction $$2Fe_2O_3 + 3C \rightarrow 4Fe + 3CO_2$$?

Accepted Answer

Fe in $$Fe_2O_3$$

Question 19

Which of the following is a real-life example of a reduction process?

Accepted Answer

The development of black-and-white photographic film

Question 20

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

Accepted Answer

Oxidation occurs

Oxidation and Reduction (Redox) Reactions: Study Guide

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