Question 1

In the reaction $$\mathrm{Cr_2O_7$$^{2-}$$ + 3\ $$HNO_2$$ + 5\ H^+ \rightarrow 2\ Cr$$^{3+}$$ + 3\ NO_3$^- + 4\ H_2O}$$, which element is being reduced?

Accepted Answer

Chromium

Question 2

Which of the following best describes the role of the oxidizing agent in a redox reaction?

Accepted Answer

It is the element or compound that is reduced.

Question 3

In the reaction $$\mathrm{Ba(s) + Cl_2$(g) \rightarrow $$BaCl_2$$(s)}$$, which species is the reducing agent?

Accepted Answer

Ba(s)

Question 4

Given the reaction $$\mathrm{Hg(l) + $$HgCl_2$$(aq) \rightarrow Hg_2Cl_2(aq)}$$, which element is oxidized?

Accepted Answer

Hg in Hg(l)

Question 5

Which of the following reactions is NOT a redox reaction?

Accepted Answer

$$\mathrm{CO_2$(g) + 2LiOH(aq) \rightarrow Li_2CO_3(aq) + H_2O(l)}$$

Question 6

In the reaction $$\mathrm{Li(s) + Zn$$^{2+}$$(aq) \rightarrow Li^+(aq) + Zn(s)}$$, which reactant is undergoing oxidation?

Accepted Answer

Li(s)

Question 7

Which statement correctly describes the process of reduction in a redox reaction?

Accepted Answer

Reduction is the gain of electrons by a species.

Question 8

In the reaction $$\mathrm{CO + 2HNO_3 + 5H^+ \rightarrow 2Cr$$^{3+}$$ + 3NO_3^- + 4H_2O}$$, which element is oxidized?

Accepted Answer

Carbon in CO

Question 9

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

Accepted Answer

The element or compound that is oxidized.

Question 10

Which of the following reactions involves the transfer of electrons between reactants?

Accepted Answer

$$\mathrm{2AgNO_3(aq) + Cu(s) \rightarrow Cu(NO_3$)_2(aq) + 2Ag(s)}$$

Question 11

In the reaction $$\mathrm{$$FeCl_2$$(aq) + 2NaOH(aq) \rightarrow Fe(OH)_2(aq) + 2NaCl(aq)}$$, which element changes its oxidation state?

Accepted Answer

None; no element changes oxidation state.

Question 12

Which of the following is true about oxidation in a redox reaction?

Accepted Answer

Oxidation is the loss of electrons by a species.

Question 13

In the reaction $$\mathrm{$$PCl_3$$(aq) + Cl_2$(g) \rightarrow $$PCl_5$$(aq)}$$, which species is oxidized?

Accepted Answer

Cl in $$Cl_2$$

Question 14

Which of the following is the correct balanced equation for the reaction between $$\mathrm{CO_2$}$$ and $$\mathrm{2LiOH}$$?

Accepted Answer

$$\mathrm{CO_2$(g) + 2LiOH(aq) \rightarrow Li_2CO_3(aq) + H_2O(l)}$$

Question 15

Which of the following is a real-world application of redox reactions?

Accepted Answer

Cellular respiration in living organisms

Question 16

In the reaction $$\mathrm{$$FeCl_2$$(aq) + 2NaOH(aq) \rightarrow Fe(OH)_2(aq) + 2NaCl(aq)}$$, what type of reaction is this?

Accepted Answer

Double displacement

Question 17

Which of the following reactions is an example of a synthesis reaction that is also a redox reaction?

Accepted Answer

$$\mathrm{$$PCl_3$$(aq) + Cl_2$(g) \rightarrow $$PCl_5$$(aq)}$$

Question 18

Which of the following best describes the change in oxidation state for lithium in the reaction $$\mathrm{Li(s) + Zn$$^{2+}$$(aq) \rightarrow Li^+(aq) + Zn(s)}$$?

Accepted Answer

Lithium goes from 0 to +1, indicating oxidation.

Question 19

Which of the following is the correct identification of oxidizing and reducing agents in the reaction $$\mathrm{Ba(s) + Cl_2$(g) \rightarrow $$BaCl_2$$(s)}$$?

Accepted Answer

Ba(s) is the reducing agent; $$Cl_2(g) is $$the oxidizing agent.

Redox Reactions and Oxidation-Reduction Agents in GOB Chemistry

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