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Learning objective

Indicate the oxidation number of an element in a compound using Roman numerals.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE ChemistryChemical reactionsCore content

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Quick explanation

Indicate the oxidation number of an element in a compound using Roman numerals

  • This point belongs to Redox, especially Redox outcomes.
  • You need to be able to indicate the oxidation number of an element in a compound using Roman numerals.
  • The key ideas to know are State and Use.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

StateUse

Why it matters

This objective helps connect Redox outcomes to exam-style questions, flashcards, and revision notes for Redox.

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Paper 3 structured question: Redox

Paper 3Theory (Core)1 marks

Description

Oxidation Numbers

Determine the oxidation numbers of the elements in the following compounds: 1. NaCl 2. H₂O 3. Fe₂O₃

  1. a

    State the oxidation number of sodium in NaCl.

    Aim for approximately 1 distinct marking point.

    [1]
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