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Carbon and carbon compounds (CO, CO2, carbonates)
Practice Questions

20 CIE IGCSE Chemistry questions on Carbon and carbon compounds (CO, CO2, carbonates), each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Carbon and carbon compounds (CO, CO2, carbonates)

Question 1 · 1 mark · Difficulty 2/3

A student investigates the thermal decomposition of copper(II) carbonate. Green copper(II) carbonate powder is heated in a test tube until no further change occurs. Which observation confirms that carbon dioxide has been produced?

  1. The residue turns black
  2. Water droplets form at the mouth of the test tube
  3. Limewater turns milky when the gas is bubbled through it
  4. The mass of the residue is less than the mass of the starting material
Show answer & explanation
✓ Answer: C — Limewater turns milky when the gas is bubbled through it
Award 1 mark for identifying that limewater turning milky (or cloudy) is the positive test for carbon dioxide. A is incorrect — the black residue is copper(II) oxide, which indicates thermal decomposition has occurred but does not specifically test for CO₂. B is incorrect — water is produced but this does not confirm CO₂ production. D is incorrect — mass decrease indicates gas evolution but does not identify which gas.
Question 2 · 1 mark · Difficulty 2/3

In many developing countries, charcoal-burning stoves are used indoors for cooking. Deaths from carbon monoxide poisoning are common in poorly ventilated rooms. Which statement best explains why carbon monoxide is produced in these conditions?

  1. Carbon burns at too high a temperature
  2. There is insufficient oxygen for complete combustion
  3. Water vapour from cooking reacts with carbon dioxide
  4. Charcoal contains impurities that release carbon monoxide
Show answer & explanation
✓ Answer: B — There is insufficient oxygen for complete combustion
Award 1 mark for recognizing that insufficient oxygen (limited air supply) causes incomplete combustion, producing carbon monoxide instead of carbon dioxide. A is incorrect — temperature does not determine CO production; oxygen availability does. C is incorrect — water vapour does not react with CO₂ to form CO. D is incorrect — CO is produced from incomplete combustion of pure carbon, not from impurities.
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CIE IGCSE Chemistry: Carbon and carbon compounds (CO, CO2, carbonates) FAQ

How many CIE IGCSE Chemistry questions on Carbon and carbon compounds (CO, CO2, carbonates) are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Carbon and carbon compounds (CO, CO2, carbonates) 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 Carbon and carbon compounds (CO, CO2, carbonates) 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 Carbon and carbon compounds (CO, CO2, carbonates) 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 Carbon and carbon compounds (CO, CO2, carbonates) typically tested on CIE IGCSE Chemistry papers?
Carbon and carbon compounds (CO, CO2, carbonates) 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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