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IB Chemistry HL 3.1.6 Oxidation States Questions

Use real exam questions to balance complex-ion charges, calculate oxidation states and explain changes between species.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Determine oxidation states of atoms in charged complexes, polyatomic ions and compounds by balancing ligand, ion and overall charge contributions.
  • Calculate and interpret average oxidation states in mixed-valence compounds and use the result to identify the possible constituent oxidation states.
  • Deduce oxidation-state changes between reactants and products or use oxidation states to identify a formula, complex charge or systematic name with correct notation.

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Study 3.1.6—Oxidation states conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 3.1.6 Oxidation States Questions question 1

[Maximum number: 1]

Nitrous acid, HNO2\mathrm{HNO}_{2}, is a weak acid which can be used to make acidic buffers.

A 1.00 moldm−31.00 \mathrm{~mol} \mathrm{dm}^{-3} solution of nitrous acid was prepared. This solution contains two conjugate acid-base pairs.

State the oxidation state of nitrogen in nitrous acid, HNO2\mathrm{HNO}_{2}.

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