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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 4 — Mastery

In the reaction $Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}$ , what is the oxidation state of zinc in $ZnCl_{2}$ ?

Which of the following represents a reduction process?

$Fe^{3+} + e^{-} \rightarrow Fe^{2+}$

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

$Ag^{+} + e^{-} \rightarrow Ag$

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

Identify the oxidizing agent in the reaction $2Na + Cl_{2} \rightarrow 2NaCl$ .

$Na$

$Cl_{2}$

$NaCl$

$e^{-}$

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

+5 to +2

+7 to +4

+7 to +2

0 to +2

What is the product of the reduction of $Cr_{2}O_{7}^{2-}$ in an acidic solution?

$Cr^{3+}$

$Cr^{6+}$

$CrO_{4}^{2-}$

$CrO_{3}$

In a redox reaction, if $A$ is oxidized and $B$ is reduced, which statement is true?

$A$ loses electrons, $B$ gains electrons.

$A$ gains electrons, $B$ loses electrons.

$A$ is the reducing agent, $B$ is the oxidizing agent.

Both $A$ and $B$ are oxidized.

What is the standard reduction potential of $Ag^{+}/Ag$ half-reaction?

$0.80 V$

$0.34 V$

$-0.76 V$

$-0.44 V$

Which of the following species undergoes oxidation in the reaction $2Fe + 3Cl_{2} \rightarrow 2FeCl_{3}$ ?

$Fe$

$Cl_{2}$

$FeCl_{3}$

$e^{-}$

In a redox reaction, what happens to the oxidation number of the oxidized species?

Increases

Decreases

Remains unchanged

Becomes zero

10.

Which of the following is a characteristic of a redox reaction?

Electron transfer

Precipitation

Acid-base reaction

Gas evolution

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