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HomeCIE IGCSE ChemistryRedox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons
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Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons
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20 CIE IGCSE Chemistry questions on Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons

Question 1 · 1 mark · Difficulty 1/3

Which statement correctly defines oxidation in terms of oxygen?

  1. A) Oxidation is the removal of oxygen from a substance.
  2. B) Oxidation is the gain of oxygen by a substance.
  3. C) Oxidation is the gain of hydrogen by a substance.
  4. D) Oxidation is the loss of electrons from oxygen.
Show answer & explanation
✓ Answer: BB) Oxidation is the gain of oxygen by a substance.
Oxidation is defined as the gain of oxygen by a substance. Conversely, reduction is the loss of oxygen. These definitions are the simplest way to identify redox reactions involving oxygen.
Question 2 · 1 mark · Difficulty 1/3

A student observes that when magnesium ribbon is burned in oxygen, a white solid is formed. Which correctly describes the magnesium in this reaction?

  1. A) Magnesium is reduced because it loses mass.
  2. B) Magnesium is oxidised because it gains oxygen.
  3. C) Magnesium is reduced because oxygen is a reducing agent.
  4. D) Magnesium is oxidised because it releases energy as light.
Show answer & explanation
✓ Answer: BB) Magnesium is oxidised because it gains oxygen.
Magnesium gains oxygen when it reacts with O₂ to form MgO, so magnesium is oxidised. The release of energy as light is a property of the reaction but does not define oxidation or reduction.
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CIE IGCSE Chemistry: Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons FAQ

How many CIE IGCSE Chemistry questions on Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons for CIE IGCSE Chemistry, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Chemistry?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons practice with other Chemistry topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons questions aligned to the official CIE IGCSE Chemistry syllabus?
Every question is written against the published CIE IGCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons typically tested on CIE IGCSE Chemistry papers?
Redox reactions: oxidation and reduction in terms of oxygen, hydrogen and electrons appears across multiple question types on real CIE IGCSE Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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