Question 1

Which of the following statements best describes the standard reduction potential ($$E^	ext{0}) of a $$species?

Accepted Answer

It measures the tendency of a species to gain electrons under standard conditions.

Question 2

Given the following standard reduction potentials: $$E^	ext{0}_{	ext{Ag}^+/	ext{Ag}} = +0.80 V$$, $$E^	ext{0}_{	ext{Cu}^{2+}/	ext{Cu}} = +0.34 V$$, $$E^	ext{0}_{	ext{Zn}^{2+}/	ext{Zn}} = -0.76 V$$, which metal is the strongest reducing agent?

Accepted Answer

Zn

Question 3

If a species has a high positive standard reduction potential, what does this indicate about its ability to act as an oxidizing agent?

Accepted Answer

It is a strong oxidizing agent.

Question 4

Which of the following will most likely donate an electron: $$H_2$$ ($$E^	ext{0} = 0.00 V) or$$ $$Li$$ ($$E^	ext{0} = -3.04 V$$)?

Accepted Answer

$$Li$$

Question 5

Rank the following metals in order of increasing strength as an oxidizing agent: $$Pb^{2+}$$ ($$E^	ext{0} = -0.13 V$$), $$Ni^{2+}$$ ($$E^	ext{0} = -0.25 V$$), $$Fe^{2+}$$ ($$E^	ext{0} = -0.44 V).$$

Accepted Answer

$$Fe^{2+}$$ \u003c $$Ni^{2+}$$ \u003c $$Pb^{2+}$$

Question 6

Which of the following species is the strongest oxidizing agent based on the standard reduction potentials: $$F_2$$ ($$E^	ext{0} = +2.87 V$$), $$Cl_2$$ ($$E^	ext{0} = +1.36 V$$), $$Br_2$$ ($$E^	ext{0} = +1.07 V$$)?

Accepted Answer

$$F_2$$

Question 7

A battery is constructed using $$Zn$$ and $$Cu$$ electrodes. Given $$E^	ext{0}_{	ext{Zn}^{2+}/	ext{Zn}} = -0.76 V $$and $$E^	ext{0}_{	ext{Cu}^{2+}/	ext{Cu}} = +0.34 V$$, what is the standard cell potential?

Accepted Answer

$$E^	ext{0}_{	ext{cell}} = 1.10 V$$

Question 8

Which of the following half-reactions represents a reduction?

Accepted Answer

$$Cu^{2+} + 2e$$^- \rightarrow Cu$$

Question 9

If $$E^	ext{0}_{	ext{cell}} is $$positive, what does this indicate about the spontaneity of the electrochemical reaction?

Accepted Answer

The reaction is spontaneous.

Question 10

Which of the following statements is true regarding the relationship between oxidizing and reducing agents?

Accepted Answer

A strong oxidizing agent has a high positive standard reduction potential.

Question 11

A patient is exposed to $$Cl_2$$ gas. Based on its standard reduction potential ($$E^	ext{0} = +1.36 V$$), what is the most likely chemical effect in the body?

Accepted Answer

It will act as a strong oxidizing agent, potentially damaging biological molecules.

Question 12

Which of the following metals will corrode most easily in water, based on their standard reduction potentials: $$Fe$$ ($$E^	ext{0} = -0.44 V$$), $$Cu$$ ($$E^	ext{0} = +0.34 V$$), $$Ag$$ ($$E^	ext{0} = +0.80 V$$)?

Accepted Answer

$$Fe$$

Question 13

Which of the following is the best definition of a reducing agent?

Accepted Answer

A substance that donates electrons to another species.

Question 14

If $$Li^+$$ has a standard reduction potential of $$-3.04 V$$, what does this indicate about $$Li$$ metal?

Accepted Answer

$$Li is a $$strong reducing agent.

Question 15

Which of the following reactions is most likely to occur spontaneously under standard conditions?

Accepted Answer

$$Zn + Cu$$^{2+}$$ \rightarrow Zn$$^{2+}$$ + Cu$$

Question 16

A solution contains both $$Fe^{2+}$$ and $$Cu^{2+}. $$Which ion will be reduced first if a current is passed through the solution?

Accepted Answer

$$Cu^{2+}$$

Question 17

Which of the following best explains why $$F_2 is a $$stronger oxidizing agent than $$Cl_2$$?

Accepted Answer

$$F_2$$ has a higher standard reduction potential than $$Cl_2.$$

Question 18

Which of the following is true about the measurement of standard reduction potentials?

Accepted Answer

They are measured under standard conditions: $$25^	ext{o}C$$, $$1 M $$solution, and pH $$= 0.$$

Question 19

Which of the following species will least likely donate an electron: $$Li$$ ($$E^	ext{0} = -3.04 V$$), $$H_2$$ ($$E^	ext{0} = 0.00 V$$), $$F_2$$ ($$E^	ext{0} = +2.87 V$$)?

Accepted Answer

$$F_2$$

Standard Reduction Potentials and Redox Chemistry

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