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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

1.

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

2.

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

A.

+6

B.

+4

C.

0

3.

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

A.

Oxidizing agent

B.

Reducing agent

C.

Catalyst

D.

Inhibitor

4.

Which of the following reactions is an example of reduction?

A.

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

5.

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

6.

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

A.

Anode

B.

Cathode

C.

Electrolyte

D.

Salt bridge

7.

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

8.

Which of the following best describes a reducing agent?

A.

It gains electrons

B.

It loses electrons

C.

It is oxidized

D.

Both B and C

9.

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

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Other Sets

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2

O

A.

Hydrogen ( $H_{2}$ )

B.

Oxygen ( $O_{2}$ )

C.

Water ( $H_{2}O$ )

D.

None of the above

D.

-2

B.

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

C.

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

D.

Both A and C

O3

A.

Iron ( $Fe$ )

B.

Oxygen ( $O_{2}$ )

C.

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

D.

None of the above

−

A.

Oxidation of $Cl^{-}$

B.

Reduction of $Cl_{2}$

C.

Oxidation of $Cl_{2}$

D.

Reduction of $Cl^{-}$

2

→

2MgO

A.

Magnesium ( $Mg$ )

B.

Oxygen ( $O_{2}$ )

C.

Magnesium oxide ( $MgO$ )

D.

None of the above

10.

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

A.

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

B.

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

C.

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

D.

None of the above

12

O6

H_{2} O