IB Chemistry SL Reactivity 3.2.1 Oxidation and Reduction

Practise recognising oxidation and reduction through electron transfer and oxidation-state change, with oxygen or hydrogen changes as supporting models. Identify the species…

Syllabus
First assessment 2025
Objective
3.2.1
Level
SL

Exam points

  • track oxidation-state increases and electron loss as oxidation in the species changed
  • track oxidation-state decreases and electron gain as reduction in the species changed
  • identify each agent from the change it causes and the opposite change it undergoes

3.2.1—Oxidation and reduction 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.

All question bank results loaded