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Oxidation Reduction

This worksheet covers Oxidation Reduction, 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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Oxidation Reduction

Chemical Reactions • Chemistry

Set 1 — Foundation

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

Hydrogen ( $H_{2}$ )

Oxygen ( $O_{2}$ )

Water ( $H_{2}O$ )

None of the above

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

-2

In a redox reaction, the substance that gains electrons is called what?

Oxidizing agent

Reducing agent

Catalyst

Inhibitor

Which of the following reactions is an example of reduction?

$Cu^{2+} + 2e^{-} \rightarrow Cu$

$Zn \rightarrow Zn^{2+} + 2e^{-}$

$Fe^{3+} + 3e^{-} \rightarrow Fe$

Both A and C

In the reaction $4Fe + 3O_{2} \rightarrow 2Fe_{2}O_{3}$ , what is being oxidized?

Iron ( $Fe$ )

Oxygen ( $O_{2}$ )

Iron(III) oxide ( $Fe_{2}O_{3}$ )

None of the above

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

Anode

Cathode

Electrolyte

Salt bridge

What is the reduction half-reaction for $Cl_{2} + 2e^{-} \rightarrow 2Cl^{-}$ ?

Oxidation of $Cl^{-}$

Reduction of $Cl_{2}$

Oxidation of $Cl_{2}$

Reduction of $Cl^{-}$

Which of the following best describes a reducing agent?

It gains electrons

It loses electrons

It is oxidized

Both B and C

In the reaction $2Mg + O_{2} \rightarrow 2MgO$ , which element is reduced?

Magnesium ( $Mg$ )

Oxygen ( $O_{2}$ )

Magnesium oxide ( $MgO$ )

None of the above

10.

What is the final product of the complete oxidation of glucose ( $C_{6}H_{12}O_{6}$ )?

$CO_{2}$ and $H_{2}O$

$O_{2}$ and $C_{6}H_{12}O_{6}$

$C_{6}H_{12}O_{6}$ and $H_{2}O$

None of the above

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