Question 1

Which of the following best describes a redox reaction?

Accepted Answer

A reaction that involves the transfer of electrons between reactants.

Question 2

In the half-reaction $$\mathrm{Mn$$^{2+}$$ (aq) \rightarrow $$MnO_4$$^- (aq)}$$, what is the change in oxidation state for manganese?

Accepted Answer

$$+2 to$$ $$+7$$

Question 3

When balancing redox reactions, what is the purpose of multiplying the half-reactions by appropriate coefficients?

Accepted Answer

To ensure the number of electrons lost equals the number gained.

Question 4

Which species is oxidized in the reaction $$\mathrm{Fe$$^{2+}$$ (aq) + Cr (s) \rightarrow Fe (s) + Cr$$^{3+}$$ (aq)}$$?

Accepted Answer

$$\mathrm{Cr}$$

Question 5

In the reaction $$\mathrm{Cl_2$ (aq) + KI (aq) \rightarrow KCl (aq) + I_2$ (aq)}$$, which element is reduced?

Accepted Answer

Chlorine

Question 6

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

Accepted Answer

$$\mathrm{Co$$^{3+}$$ (aq) + e^- \rightarrow Co$$^{2+}$$ (aq)}$$

Question 7

In the reaction $$\mathrm{Ce$$^{4+}$$ (aq) + Sn$$^{2+}$$ (aq) \rightarrow Ce$$^{3+}$$ (aq) + Sn$$^{4+}$$ (aq)}$$, which species acts as the reducing agent?

Accepted Answer

$$\mathrm{Sn$$^{2+}$$}$$

Question 8

Which step is necessary to balance the overall charge in a redox reaction?

Accepted Answer

Add electrons to the more negative side of each half-reaction.

Question 9

Given the half-reactions: $$\mathrm{Fe$$^{2+}$$ (aq) \rightarrow Fe (s) + 2e^-}$$ and $$\mathrm{Cr (s) \rightarrow Cr$$^{3+}$$ (aq) + 3e^-}$$, what is the least common multiple of electrons to balance the redox reaction?

Accepted Answer

$$6$$

Question 10

Which of the following is the correct balanced overall redox reaction for $$\mathrm{Fe$$^{2+}$$ (aq) + Cr (s) \rightarrow Fe (s) + Cr$$^{3+}$$ (aq)}$$?

Accepted Answer

$$3Fe^{2+} (aq) + 2Cr (s$$) \rightarrow 3Fe (s) + $$2Cr^{3+} (aq$$)$$

Question 11

In the reaction $$\mathrm{Cl_2$ (aq) + 2KI (aq) \rightarrow 2KCl (aq) + I_2$ (aq)}$$, what is the oxidation state change for iodine?

Accepted Answer

$$-1 to$$ $$0$$

Question 12

Which of the following is a correct step in balancing redox reactions in acidic solution?

Accepted Answer

Add $$\mathrm{H^+}$$ ions to balance hydrogen.

Question 13

In the half-reaction $$\mathrm{Cl_2$ (aq) \rightarrow 2Cl^- (aq)}$$, how many electrons are gained or lost?

Accepted Answer

2 electrons gained

Question 14

Which of the following statements about half-reactions is correct?

Accepted Answer

Half-reactions are used to identify oxidation and reduction processes separately.

Question 15

In the reaction $$\mathrm{Ce$$^{4+}$$ (aq) + Sn$$^{2+}$$ (aq) \rightarrow Ce$$^{3+}$$ (aq) + Sn$$^{4+}$$ (aq)}$$, what is the total number of electrons transferred?

Accepted Answer

2 electrons

Question 16

Which of the following is the correct balanced half-reaction for the oxidation of $$\mathrm{Sn$$^{2+}$$} to$$ $$\mathrm{Sn$$^{4+}$$}$$?

Accepted Answer

$$\mathrm{Sn$$^{2+}$$ (aq) \rightarrow Sn$$^{4+}$$ (aq) + 2e^-}$$

Question 17

What is the correct order of steps for balancing a redox reaction using the half-reaction method?

Accepted Answer

Break into half-reactions, balance electrons, multiply to equalize electrons, combine and cancel electrons.

Question 18

In the reaction $$\mathrm{Ni (s) + Co$$^{3+}$$ (aq) \rightarrow Ni$$^{2+}$$ (aq) + Co$$^{2+}$$ (aq)}$$, which element is reduced?

Accepted Answer

Cobalt

Question 19

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

Accepted Answer

Photosynthesis in plants

Balancing Redox Reactions: Concepts and Practice for GOB Chemistry

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