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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 3 — Foundation

In the reaction $2H_{2} + O_{2} \rightarrow 2H_{2}O$ , what is being oxidized?

$H_{2}$

$O_{2}$

$H_{2}O$

$None$

Which species is reduced in the reaction $2Fe^{3+} + 2e^{-} \rightarrow 2Fe^{2+}$ ?

$Fe^{3+}$

$Fe^{2+}$

$e^{-}$

$None$

In a redox reaction, what does the term 'oxidation' refer to?

Loss of electrons

Gain of electrons

Formation of an oxide

None of the above

Identify the reducing agent in the reaction $Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}$ .

$Zn$

$HCl$

$ZnCl_{2}$

$H_{2}$

What is the oxidation state of sulfur in $ext{H}_{2} ext{SO}_{4}$ ?

-2

In the reaction $2MnO_{4}^{-} + 5C_{2}O_{4}^{2-} \rightarrow 2Mn^{2+} + 10CO_{2} + 8H_{2}O$ , what is being reduced?

$MnO_{4}^{-}$

$C_{2}O_{4}^{2-}$

$CO_{2}$

$H_{2}O$

What type of reaction is $2Na + Cl_{2} \rightarrow 2NaCl$ ?

Redox reaction

Acid-base reaction

Double displacement reaction

Combustion reaction

In the context of redox reactions, what does the term 'reduction' mean?

Gain of electrons

Loss of electrons

Increase in size

Decrease in temperature

In the half-reaction $Cu^{2+} + 2e^{-} \rightarrow Cu$ , what is happening to copper?

It is being oxidized

It is being reduced

It is neutral

It is being ionized

10.

What is the product formed when $Fe^{2+}$ is oxidized to $Fe^{3+}$ ?

$Fe^{3+}$

$Fe^{2+}$

$Fe$

$FeO$

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