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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 5 — Mastery

In the reaction $Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu$ , which species is oxidized?

Copper ion ( $Cu^{2+}$ )

Zinc ( $Zn$ )

Zinc ion ( $Zn^{2+}$ )

Copper ( $Cu$ )

In a redox reaction, the reducing agent is the species that:

Gains electrons

Loses electrons

Is oxidized

Both B and C

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

Which of the following statements is true regarding the reaction $2Fe^{3+} + 2e^{-} \rightarrow 2Fe^{2+}$ ?

Iron is reduced.

Iron is oxidized.

Electrons are lost.

Both A and C.

During the electrolysis of water, $H_{2}O$ is decomposed into $H_{2}$ and $O_{2}$ . Which is the oxidation half-reaction?

$2H_{2}O \rightarrow H_{2} + O_{2} + 4H^{+} + 4e^{-}$

$2H_{2}O + 4e^{-} \rightarrow 2H_{2} + 4OH^{-}$

$2H_{2}O \rightarrow O_{2} + 4H^{+} + 4e^{-}$

$H_{2}O + 2e^{-} \rightarrow H_{2} + 2OH^{-}$

Which of the following pairs represents a redox reaction?

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

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

$CaCO_{3} \rightarrow CaO + CO_{2}$

$N_{2} + 3H_{2} \rightarrow 2NH_{3}$

What is the overall change in oxidation number for carbon in the reaction $C + 2O_{2} \rightarrow CO_{2}$ ?

-4

-2

In the reaction $2H_{2} + O_{2} \rightarrow 2H_{2}O$ , what is the role of oxygen?

Reducing agent

Oxidizing agent

Neither

Catalyst

Identify the species that is reduced in the reaction $2K + Cl_{2} \rightarrow 2KCl$ .

Potassium ( $K$ )

Chlorine ( $Cl_{2}$ )

Potassium ion ( $K^{+}$ )

Chloride ion ( $Cl^{-}$ )

10.

In a galvanic cell, which electrode is the site of reduction?

Anode

Cathode

Salt bridge

Electrolyte

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Other Sets

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Set 1Foundation Set 2Foundation Set 3Foundation Set 4Mastery Set 5Mastery Custom Worksheet