$\text{Oxide: } \mathrm{O^{2-}},\ \text{Peroxide: } \mathrm{O_2^{2-}},\ \text{Superoxide: } \mathrm{O_2^-}$

Question 1

Which of the following best describes the difference between oxides, peroxides, and superoxides in terms of their oxygen anion formulas?

Accepted Answer

$	ext{Oxide: } \mathrm{O^{2-}},\ 	ext{Peroxide: } \mathrm{O_2^{2-}},\ 	ext{Superoxide: } \mathrm{O_2^-}$

Question 2

Which group of metals most commonly forms peroxides when reacting with oxygen?

Accepted Answer

Group 2A (alkaline earth metals)

Question 3

What is the correct formula for sodium peroxide?

Accepted Answer

$\mathrm{Na_2O_2}$

Question 4

Which of the following compounds is a superoxide?

Accepted Answer

$\mathrm{KO_2}$

Question 5

When potassium reacts with oxygen, which product is formed under standard conditions?

Accepted Answer

$\mathrm{KO_2}$

Question 6

Which of the following balanced equations represents the formation of barium peroxide from barium and oxygen?

Accepted Answer

$\mathrm{Ba(s) + O_2(g) \rightarrow BaO_2(s)}$

Question 7

Which of the following best explains why Group 1A metals form different oxygen compounds as you move down the group?

Accepted Answer

The ability to form peroxides and superoxides increases down the group due to decreasing ionization energy.

Question 8

Which of the following is the correct classification for $\mathrm{Li_2O}$?

Accepted Answer

Oxide

Question 9

A sample of $\mathrm{BaO_2}$ is heated strongly. Which product is most likely to form?

Accepted Answer

$\mathrm{BaO}$

Question 10

Which of the following statements is true regarding the oxygen content in oxides, peroxides, and superoxides?

Accepted Answer

Superoxides contain more oxygen per metal atom than peroxides.

Question 11

Which of the following is the correct formula for rubidium superoxide?

Accepted Answer

$\mathrm{RbO_2}$

Question 12

Which of the following best describes the charge on the oxygen species in peroxides?

Accepted Answer

Each oxygen atom has an oxidation state of $-1$.

Question 13

Which of the following reactions represents the formation of sodium peroxide from its elements?

Accepted Answer

$\mathrm{2Na(s) + O_2(g) \rightarrow Na_2O_2(s)}$

Question 14

Which of the following compounds would you expect to form when cesium reacts with oxygen?

Accepted Answer

$\mathrm{CsO_2}$

Question 15

Which of the following is a correct statement about the trend in the formation of oxides, peroxides, and superoxides among Group 1A metals?

Accepted Answer

The tendency to form superoxides increases as you move down the group.

Question 16

Which of the following best describes the oxygen species present in $\mathrm{KO_2}$?

Accepted Answer

Superoxide ion, $\mathrm{O_2^-}$

Question 17

Which of the following is the correct balanced equation for the reaction of lithium with oxygen?

Accepted Answer

$\mathrm{4Li(s) + O_2(g) \rightarrow 2Li_2O(s)}$

Question 18

Which of the following best explains why potassium forms a superoxide rather than an oxide when reacting with oxygen?

Accepted Answer

Potassium's larger ionic radius stabilizes the superoxide ion.

Question 19

Which of the following is the correct classification for $\mathrm{BaO_2}$?

Accepted Answer

Peroxide

Question 20

Which of the following is the correct formula for magnesium oxide?

Accepted Answer

$\mathrm{MgO}$

Oxides, Peroxides, and Superoxides: Properties, Formulas, and Reactions

Study Guide - Practice Questions