Question 1

Which of the following represents a reduction half-reaction?

Accepted Answer

$$\mathrm{Cr}^{3+}(aq) + 3e$$^{-}$$ \rightarrow \mathrm{Cr}(s)$$

Question 2

In the reaction $$\mathrm{Zn}(s) + \mathrm{Cl}_2(g) \rightarrow \mathrm{ZnCl}_2(s)$$, which species is oxidized?

Accepted Answer

$$\mathrm{Zn}(s)$$

Question 3

Which of the following reactions is an example of oxidation?

Accepted Answer

$$2\mathrm{Br}^{-}(aq) \rightarrow \mathrm{Br}_2(l) + 2e$$^{-}$$

Question 4

In the reaction $$\mathrm{Cl}_2(g) + 2\mathrm{NaBr}(aq) \rightarrow 2\mathrm{NaCl}(aq) + \mathrm{Br}_2(l)$$, which reactant is reduced?

Accepted Answer

$$\mathrm{Cl}_2(g)$$

Question 5

Which of the following best describes the change in oxidation state for lead in the reaction $$2\mathrm{PbO}(s) \rightarrow 2\mathrm{Pb}(s) + \mathrm{O}_2(g)$$?

Accepted Answer

Lead is reduced from +2 to 0

Question 6

In the reaction $$2\mathrm{Fe}^{3+}(aq) + \mathrm{Sn}^{2+}(aq) \rightarrow 2\mathrm{Fe}^{2+}(aq) + \mathrm{Sn}^{4+}(aq)$$, which species is oxidized?

Accepted Answer

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

Question 7

Which of the following reactions involves the reduction of hydrogen ions?

Accepted Answer

$$2\mathrm{H}^{+}(aq) + 2e$$^{-}$$ \rightarrow \mathrm{H}_2(g)$$

Question 8

In the reaction $$2\mathrm{Li}(s) + \mathrm{F}_2(g) \rightarrow 2\mathrm{LiF}(s)$$, which element is reduced?

Accepted Answer

Fluorine

Question 9

Which of the following is the correct balanced half-reaction for the reduction of oxygen in aqueous solution?

Accepted Answer

$$\mathrm{O}_2(g) + 4e$$^{-}$$ \rightarrow 2\mathrm{O}^{2-}(aq)$$

Question 10

In the reaction $$\mathrm{Cl}_2(g) + 2\mathrm{KI}(aq) \rightarrow \mathrm{I}_2(s) + 2\mathrm{KCl}(aq)$$, which reactant is oxidized?

Accepted Answer

$$\mathrm{I}^{-}(aq)$$

Question 11

Which of the following is the correct oxidation half-reaction for silver?

Accepted Answer

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

Question 12

In the reaction $$2\mathrm{Al}(s) + 3\mathrm{Sn}^{2+}(aq) \rightarrow 3\mathrm{Sn}(s) + 2\mathrm{Al}^{3+}(aq)$$, which species is reduced?

Accepted Answer

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

Question 13

Which of the following reactions shows the oxidation of bromide ions?

Accepted Answer

$$2\mathrm{Br}^{-}(aq) \rightarrow \mathrm{Br}_2(l) + 2e$$^{-}$$

Question 14

In the reaction $$\mathrm{Ni}(s) \rightarrow \mathrm{Ni}^{2+}(aq) + 2e$$^{-}$$, what type of process is occurring?

Accepted Answer

Oxidation

Question 15

Which of the following best describes the electron transfer in the reaction $$\mathrm{Cr}^{3+}(aq) + 3e$$^{-}$$ \rightarrow \mathrm{Cr}(s)$$?

Accepted Answer

Chromium is reduced by gaining electrons

Question 16

In a redox reaction, which statement is always true?

Accepted Answer

The oxidized species loses electrons

Question 17

Which of the following is a correct example of a reduction half-reaction involving iron?

Accepted Answer

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

Question 18

In the reaction $$\mathrm{O}_2(g) + 4e$$^{-}$$ \rightarrow 2\mathrm{O}^{2-}(aq)$$, what is the change in oxidation state for oxygen?

Accepted Answer

0 to -2

Question 19

Which of the following reactions is a real-world example of a redox process used in batteries?

Accepted Answer

$$2\mathrm{Li}(s) + \mathrm{F}_2(g) \rightarrow 2\mathrm{LiF}(s)$$

Redox Reactions: Identification of Oxidation, Reduction, and Reactants in GOB Chemistry

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