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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