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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 1 — Foundation

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

Iron ion ( $Fe^{3+}$ )

Electron ( $e^{-}$ )

Iron ion ( $Fe^{2+}$ )

None of the above

Which of the following species is acting as the oxidizing agent in the reaction $Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu$ ?

Zinc ( $Zn$ )

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

Copper ( $Cu$ )

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

In a redox reaction, what happens to the oxidation state of the reducing agent?

Decreases

Increases

Remains the same

Becomes zero

What is the oxidation state of sulfur in $H_{2}SO_{4}$ ?

-2

In the half-reaction $Cl_{2} + 2e^{-} \rightarrow 2Cl^{-}$ , what is being reduced?

Chlorine gas ( $Cl_{2}$ )

Chloride ion ( $Cl^{-}$ )

Electron ( $e^{-}$ )

None of the above

Which of the following reactions is a redox reaction?

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

$NaCl \rightarrow Na + Cl$

$HCl \rightarrow H^{+} + Cl^{-}$

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

In the reaction $2Mg + O_{2} \rightarrow 2MgO$ , what is the oxidation state of magnesium in $MgO$ ?

-2

What is the main characteristic of a redox reaction?

No change in oxidation states

Transfer of electrons

Formation of a gas

Change in temperature

In the reaction $4Fe + 3O_{2} \rightarrow 2Fe_{2}O_{3}$ , how many electrons are transferred per iron atom?

10.

What happens to the oxidation state of a substance that is oxidized?

Decreases

Increases

Remains the same

Becomes negative

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Other Sets

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