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Redox Reactions

This worksheet covers Redox Reactions, which is part of the Chemical Reactions module in the Chemistry course. Practice problems are designed to strengthen key concepts and build confidence.

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Redox Reactions

Chemical Reactions • Chemistry

Set 4 — Mastery

In the reaction $2Fe^{3+} + 2e^{-} \rightarrow 2Fe^{2+}$ , which species is reduced?

$Fe^{3+}$

$Fe^{2+}$

$e^{-}$

$O_{2}$

In the redox reaction $4Fe + 3O_{2} \rightarrow 2Fe_{2}O_{3}$ , what is the oxidation state of iron in $Fe_{2}O_{3}$ ?

$+3$

$0$

$+2$

$-3$

Identify the oxidizing agent in the reaction $Cu^{2+} + Zn \rightarrow Cu + Zn^{2+}$ .

$Cu^{2+}$

$Zn$

$Cu$

$Zn^{2+}$

In the half-reaction $MnO_{4}^{-} + 8H^{+} + 5e^{-} \rightarrow Mn^{2+} + 4H_{2}O$ , what is the change in oxidation state of manganese?

$+7$ to $+2$

$+2$ to $+7$

$0$ to $+2$

$+2$ to $0$

What is the balanced equation for the redox reaction between $H_{2}$ and $Cl_{2}$ ?

$H_{2} + Cl_{2} \rightarrow 2HCl$

$2H_{2} + Cl_{2} \rightarrow 2HCl$

$H_{2} + 2Cl_{2} \rightarrow 2HCl$

$H_{2} + Cl_{2} \rightarrow HCl$

In a redox reaction, which of the following best represents oxidation?

Loss of electrons

Gain of electrons

Loss of protons

Gain of protons

Which of the following reactions is an example of a disproportionation reaction?

$2H_{2}O_{2} \rightarrow 2H_{2}O + O_{2}$

$Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu$

$2Na + Cl_{2} \rightarrow 2NaCl$

$Fe^{2+} + MnO_{4}^{-} \rightarrow Fe^{3+} + Mn^{2+}$

What is the standard reduction potential for the half-reaction $Ag^{+} + e^{-} \rightarrow Ag$ ?

$+0.80 V$

$-0.80 V$

$+0.50 V$

$0 V$

In the redox reaction $3H_{2} + N_{2} \rightarrow 2NH_{3}$ , what is being oxidized?

$H_{2}$

$N_{2}$

$NH_{3}$

None of the above

10.

Which of the following is a characteristic of redox reactions?

Transfer of electrons

Change in temperature

Formation of precipitates

Change in pressure

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