Question 1

Which of the following statements correctly describes oxidation in a redox reaction?

Accepted Answer

Oxidation is the loss of electrons and an increase in oxidation number.

Question 2

What is the oxidation number of oxygen in hydrogen peroxide ($$H_2O_2$$)?

Accepted Answer

$$-1$$

Question 3

In the reaction $$2Na + Cl_2$ \rightarrow 2NaCl$$, which element is oxidized and which is reduced?

Accepted Answer

Na is oxidized, Cl is reduced.

Question 4

Assign the oxidation number to sulfur in $$SO_2.$$

Accepted Answer

$$+4$$

Question 5

Which of the following compounds contains hydrogen with an oxidation number of $$-1$$?

Accepted Answer

$$MgH_2$$

Question 6

A redox reaction must involve:

Accepted Answer

A change in oxidation number for at least one element.

Question 7

Which of the following is the strongest oxidizing agent?

Accepted Answer

Cl$$_2$$

Question 8

In the cell notation $$Zn(s) | Zn$$^{2+}$$(1M) || Cu$$^{2+}$$(1M) | Cu(s)$$, which electrode is the anode?

Accepted Answer

Zn(s)

Question 9

Calculate the standard cell potential ($$E_{cell}^	ext{o}) $$for a cell constructed from $$Mg^{2+}/Mg$ (E^	$$ext{o} = -2.37$$ V) and Ag^+/Ag$ (E^	$$ext{o} = +0.80$$ V).

Accepted Answer

$$+3.17 V$$

Question 10

Which of the following best describes a disproportionation reaction?

Accepted Answer

A reaction in which a substance acts as both oxidizing and reducing agent.

Question 11

Given the half-reactions: $$Zn \rightarrow Zn$$^{2+}$$ + 2e^-$$ ($$E^	ext{o} = -0.76 V) $$and $$Cu^{2+} + 2e$$^- \rightarrow Cu$$ (E^	$$ext{o} = +0.34$$ V), what is the overall cell potential?

Accepted Answer

$$+1.10 V$$

Question 12

In a concentration cell with $$Cu(s) | Cu$$^{2+}$$(0.01M) || Cu$$^{2+}$$(1.0M) | Cu(s)$$, which side acts as the anode?

Accepted Answer

The side with $$Cu^{2+}(0.01M$$)$$

Question 13

Which of the following is true about the standard hydrogen electrode (SHE)?

Accepted Answer

It is assigned a potential of $$0.00 V.$$

Question 14

In a lead-acid battery, which reaction occurs at the anode during discharge?

Accepted Answer

$$Pb(s) + $$HSO_4$$^-(aq) + H_2O \rightarrow $$PbSO_4$$ + 2e^- + H_3O^+$$

Question 15

Which of the following is a correct statement about a galvanic cell?

Accepted Answer

It converts chemical energy into electrical energy via a spontaneous reaction.

Question 16

In the reaction $$H_2O_2 \rightarrow H_2O + O_2$, what role does H_2O_2$ play?

Accepted Answer

Both oxidizing and reducing agent.

Question 17

Which of the following is the correct Nernst equation for a cell at $$298 K $$with $$n=2$$ electrons transferred?

Accepted Answer

$$E_{cell} = E_{cell}^	ext{o} - \frac{0.0591}{2} \log Q$$

Question 18

Which of the following metals would act as the strongest reducing agent when paired with the standard hydrogen electrode?

Accepted Answer

Mg ($$E^	ext{o} = -2.37 V)$$

Question 19

Which of the following statements about corrosion is correct?

Accepted Answer

Corrosion is a redox process that can be prevented by using protective coatings.

Redox Reactions and Oxidation Numbers: Study Notes for General Chemistry

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