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IB Chemistry SL 3.2.1 Oxidation and Reduction Questions

Use real SL exam questions to track oxidation-state and electron changes, identify redox agents and interpret redox equations.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Identify oxidation or reduction from oxidation-state changes, electron loss or gain, and oxygen/hydrogen changes in the stated species.
  • Identify the oxidizing and reducing agents and the species oxidized or reduced, justifying each assignment from the redox change.
  • Write or interpret redox and disproportionation equations and distinguish redox reactions from non-redox reaction types using the reactants and products.

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Study 3.2.1—Oxidation and reduction conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 3.2.1 Oxidation and Reduction Questions question 1

[Maximum number: 1]

Chlorine undergoes many reactions.

2.67 g of manganese(IV) oxide was added to 200.0 cm3200.0 \mathrm{~cm}^{3} of 2.00moldmm−3HCl2.00 \mathrm{moldm} \mathrm{m}^{-3} \mathrm{HCl}.

MnO2( s)+4HCl(aq)→Cl2( g)+2H2O(l)+MnCl2(aq)\mathrm{MnO}_{2}(\mathrm{~s})+4 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{MnCl}_{2}(\mathrm{aq})

Deduce, referring to oxidation states, whether MnO2\mathrm{MnO}_{2} is an oxidizing or reducing agent.

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