Question 1

Which of the following best describes an oxidation reaction?

Accepted Answer

A reaction in which a substance loses electrons.

Question 2

In the reaction $$2Mg + O_2$ \rightarrow 2MgO$$, which element is oxidized?

Accepted Answer

Magnesium

Question 3

What is the oxidation number of sulfur in $$H_2SO_4$$?

Accepted Answer

$$+6$$

Question 4

Which of the following is a reduction reaction?

Accepted Answer

Formation of hydrogen gas from acid: $$2H^+ + 2e^- \rightarrow H_2$

Question 5

Assign the oxidation number to chlorine in $$KClO_3.$$

Accepted Answer

$$+5$$

Question 6

Which rule is correct for assigning oxidation numbers?

Accepted Answer

The oxidation number of oxygen is usually $$-2$$ except in peroxides.

Question 7

In the reaction $$Fe^{2+}$$ + $$MnO_4$$^- \rightarrow $$Fe^{3+}$$ + $$Mn^{2+} (in $$acidic solution), which species is reduced?

Accepted Answer

$$MnO_4$$^-$$

Question 8

Which of the following is the correct balanced half-reaction for the reduction of $$Cr_2O_7$$^{2-}$$ in acidic solution?

Accepted Answer

$$Cr_2O_7$$^{2-}$$ + 14H^+ + 6e^- \rightarrow 2Cr$$^{3+}$$ + 7H_2O$$

Question 9

Which statement about oxidation numbers is FALSE?

Accepted Answer

The oxidation number of oxygen in $$H_2O_2 is$$ $$-2.$$

Question 10

In the reaction $$2Fe^{3+} + 2I$$^- \rightarrow $$2Fe^{2+}$$ + $$I_2$$, which species is oxidized?

Accepted Answer

$$I^-$$

Question 11

Which of the following reactions is NOT a redox reaction?

Accepted Answer

$$NaCl + $$AgNO_3$$ \rightarrow AgCl + $$NaNO_3$$

Question 12

What is the sum of the oxidation numbers in the sulfate ion $$SO_4$$^{2-}$$?

Accepted Answer

$$-2$$

Question 13

Which of the following is the correct balanced equation for the reaction between $$Fe^{2+}$$ and $$Cr_2O_7$$^{2-}$$ in acidic solution?

Accepted Answer

$$6Fe^{2+} + Cr_2O$$_$$7^{2-} + 14H$$^+ \rightarrow $$6Fe^{3+}$$ + $$2Cr^{3+} + 7H_2O$

Question 14

A patient is exposed to carbon monoxide ($$CO) $$poisoning. Which redox process is most directly involved in the toxicity?

Accepted Answer

CO binds to hemoglobin, preventing oxygen from being reduced.

Question 15

Which of the following is the correct half-reaction for the oxidation of $$Zn in $$the reaction $$Zn + Cu$$^{2+}$$ \rightarrow Zn$$^{2+}$$ + Cu$$?

Accepted Answer

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

Question 16

In balancing redox equations using the half-reaction method, what is the first step?

Accepted Answer

Balance the atoms other than O and H.

Question 17

Which of the following is a correct statement about the sum of oxidation numbers in a neutral compound?

Accepted Answer

It is always zero.

Question 18

In the reaction $$2H_2O_2 \rightarrow 2H_2O + O_2$, what is the change in oxidation number of oxygen?

Accepted Answer

From $$-1 to$$ $$-2$$ and $$0$$

Question 19

Which of the following is the correct balanced equation for the reaction: $$Fe^{2+}$$ + $$MnO_4^- + H$$^+ \rightarrow $$Fe^{3+}$$ + $$Mn^{2+} + H_2O$?

Accepted Answer

$$5Fe^{2+}$$ + $$MnO_4^- + 8H$$^+ \rightarrow $$5Fe^{3+}$$ + $$Mn^{2+} + 4H_2O$

Oxidation-Reduction Reactions and Stoichiometry: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards