Question 1

Which of the following best describes the process of oxidation in a redox reaction?

Accepted Answer

The loss of electrons by a chemical species.

Question 2

Given the reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$, which species is oxidized and which is reduced?

Accepted Answer

Zn is oxidized, Cu$$^{2+} is $$reduced.

Question 3

What is the oxidation number of oxygen in hydrogen peroxide ($$\mathrm{H_2O_2}$$)?

Accepted Answer

$$-1$$

Question 4

Which of the following statements about standard redox potentials ($$E^\circ) is $$correct?

Accepted Answer

A more positive $$E^\circ$$ means a stronger oxidizing agent.

Question 5

In the voltaic cell shown, which electrode acts as the anode and what process occurs there?

Accepted Answer

Zinc, oxidation

Question 6

Calculate the standard cell potential ($$E^\circ_{cell}) $$for the reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$ given $$E^\circ(\mathrm{Cu$$^{2+}$$/Cu}) = 0.34\ \mathrm{V}$$ and $$E^\circ(\mathrm{Zn$$^{2+}$$/Zn}) = -0.76\ \mathrm{V}.$$

Accepted Answer

$$1.10\ \mathrm{V}$$

Question 7

Which of the following best explains why fluorine is the strongest oxidizing agent among the elements?

Accepted Answer

It has the highest standard reduction potential.

Question 8

What is the change in oxidation number for iron in the reaction $$4\mathrm{Fe} + 3\mathrm{O}_2 \rightarrow 2\mathrm{Fe}_2\mathrm{O}_3$$?

Accepted Answer

From 0 to +3

Question 9

Which of the following is the correct Nernst equation for the cell reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)} at$$ $$25^\circC$$?

Accepted Answer

$$E = E^\circ - \dfrac{0.059}{2} \log \dfrac{[\mathrm{Zn}^{2+}]}{[\mathrm{Cu}^{2+}]}$$

Question 10

A lead-acid battery uses the following overall discharge reaction: $$\mathrm{Pb + $$PbO_2$$ + 2H_2SO_4 \rightarrow 2PbSO_4 + 2H_2O}. $$What is the role of sulfuric acid in this battery?

Accepted Answer

It acts as the electrolyte and participates in the reaction.

Question 11

Which of the following best describes the trend of electronegativity in the periodic table?

Accepted Answer

It increases from left to right and from bottom to top.

Question 12

In the reaction $$\mathrm{Fe + $$CuSO_4$$ \rightarrow $$FeSO_4$$ + Cu}$$, which element is acting as the reducing agent?

Accepted Answer

Fe

Question 13

Which of the following batteries is rechargeable?

Accepted Answer

Lead-acid battery

Question 14

For the redox couple $$\mathrm{Fe$$^{3+}$$/Fe^{2+}$$}$, what is the half-reaction for reduction?

Accepted Answer

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

Question 15

Which of the following is true about the relationship between Gibbs free energy and cell potential for a redox reaction?

Accepted Answer

$$\Delta G = -nFE$$

Question 16

Which of the following species has the highest oxidation state for manganese?

Accepted Answer

$$\mathrm{$$MnO_4$$^-}$$

Question 17

Which of the following reactions is NOT a redox reaction?

Accepted Answer

$$\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}$$

Question 18

If $$E^\circ(\mathrm{Ag^+/Ag}) = 0.80\ \mathrm{V}$$ and $$E^\circ(\mathrm{Cu$$^{2+}$$/Cu}) = 0.34\ \mathrm{V}$$, which of the following statements is correct?

Accepted Answer

Ag$$^+$$ will oxidize Cu.

Redox Reactions and Electrochemistry: Principles, Applications, and Experimental Observations

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