JEE Main Unit 9A: Redox Processes & Electrochemical Cells — practice questions

Explore 2 free Unit 9A: Redox Processes & Electrochemical Cells questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 9A: Redox Processes & Electrochemical Cells questions and exercises with answers

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Which half-reaction from the notes is an example of reduction?Read the answer and worked solution →Match the ion to its common oxidation stateRead the answer and worked solution →

Worked practice questions

Which half-reaction from the notes is an example of reduction?

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

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Correct answer: C. $Cu^{2+} + 2e^- \rightarrow Cu$

Reduction involves gain of electrons. In $Cu^{2+} + 2e^- \rightarrow Cu$, copper ions gain electrons to form copper metal, so this is the reduction half-reaction.

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Match the ion to its common oxidation state

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Matching pairs

Left
Fe²⁺ in FeO
Right
+2
Left
Fe in Fe₂O₃
Right
+3
Left
Mn in KMnO₄
Right
+7

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