Q: Which of the following reactions is a spontaneous redox reaction based on the activity series?

$$\text{Al} (s) + \text{Ag}^+ (aq) \rightarrow \text{Al}^{3+} (aq) + \text{Ag} (s)$$

Q: What is the correct balanced half-reaction at the anode for the following overall cell reaction? $$3\text{MnO}_4^- (aq) + 5\text{Fe} (s) \rightarrow 3\text{Mn}^{2+} (aq) + 5\text{Fe}^{3+} (aq)$$

$$\text{Fe} (s) \rightarrow \text{Fe}^{3+} (aq) + 3e^-$$

Q: In balancing redox reactions in basic solution, what is the final step after balancing as if in acid?

Add $$\text{OH}^- to $$both sides to neutralize $$\text{H}^+.$$

Question 1

Which of the following statements best describes the oxidation number of an atom in its natural (elemental) state?

Accepted Answer

It is always zero.

Question 2

For a monoatomic ion, the oxidation number is:

Accepted Answer

Equal to its charge.

Question 3

Which of the following compounds contains oxygen with the lowest oxidation state?

Accepted Answer

Cs$$_2O$_2$$

Question 4

In the reaction $$2	ext{Li} (s) + 	ext{Zn}^{2+} (aq) ightarrow 2	ext{Li}^+ (aq) + 	ext{Zn} (s)$$, which species is oxidized?

Accepted Answer

Li

Question 5

Which of the following best describes the role of the salt bridge in a galvanic cell?

Accepted Answer

It allows ions to flow between half-cells to maintain charge balance.

Question 6

Which of the following reactions is a spontaneous redox reaction based on the activity series?

Accepted Answer

$$	ext{Al} (s) + 	ext{Ag}^+ (aq) ightarrow 	ext{Al}^{3+} (aq) + 	ext{Ag} (s)$$

Question 7

Which element is the best reducing agent according to the activity series?

Accepted Answer

Lithium

Question 8

In a galvanic cell, which process occurs at the anode?

Accepted Answer

Oxidation

Question 9

Which of the following is TRUE for a voltaic cell, but FALSE for an electrolytic cell?

Accepted Answer

The flow of electrons is spontaneous.

Question 10

Balance the following redox reaction in acidic solution: $$	ext{NO}_2^- (aq) + 	ext{Cr}_2	ext{O}_7$$^{2-}$$ (aq) ightarrow 	ext{Cr}^{3+} (aq) + 	ext{NO}_3^- (aq). $$What is the coefficient of $$	ext{Cr}^{3+} in $$the balanced equation?

Accepted Answer

2

Question 11

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

Accepted Answer

Reduction occurs and electrons are gained.

Question 12

Which of the following metals could be used to reduce $$	ext{Ni}^{2+}$$ ions to solid Ni in solution?

Accepted Answer

Mn

Question 13

In the reaction $$	ext{Cr}_2	ext{O}_7$$^{2-}$$ + 3	ext{HNO}_2 + 5	ext{H}^+ ightarrow 2	ext{Cr}^{3+} + 3	ext{NO}_3^- + 4	ext{H}_2	ext{O}$$, which element is being reduced?

Accepted Answer

Cr

Question 14

Which of the following is true about an electrolytic cell?

Accepted Answer

It uses an electrical current to make a nonspontaneous reaction go.

Question 15

What is the correct balanced half-reaction at the anode for the following overall cell reaction? $$3	ext{MnO}_4^- (aq) + 5	ext{Fe} (s) ightarrow 3	ext{Mn}^{2+} (aq) + 5	ext{Fe}^{3+} (aq)$$

Accepted Answer

$$	ext{Fe} (s) ightarrow 	ext{Fe}^{3+} (aq) + 3e^-$$

Question 16

Which of the following represents an oxidation-reduction reaction?

Accepted Answer

I, II, and III

Question 17

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

Question 18

In balancing redox reactions in basic solution, what is the final step after balancing as if in acid?

Accepted Answer

Add $$	ext{OH}^- to $$both sides to neutralize $$	ext{H}^+.$$

Oxidation and Reduction (Redox) Chemistry: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards