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Cambridge IGCSE Chemistry practice

What is the oxidation number of an uncombined element?

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MCQ

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cambridge_mcq

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Topic

Redox

Exam-style question

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What is the oxidation number of an uncombined element?.

  1. A.0
  2. B.+1
  3. C.-1
  4. D.Varies

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Description

Oxidation Number Rules

1. Uncombined elements have an oxidation number of 0. 2. The oxidation number of a monatomic ion equals its charge. 3. The total oxidation numbers in a compound sum to 0. 4. The total oxidation numbers in an ion equal its charge.

  1. a

    State the oxidation number of an uncombined element.

    Aim for approximately 1 distinct marking point.

    [1]