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CIE · IGCSE · Chemistry

Carbonates
Practice Questions

20 CIE IGCSE Chemistry questions on Carbonates, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Carbonates

Question 1 · 1 mark · Difficulty 1/3

Limestone is heated strongly in a lime kiln at temperatures above 900°C. Which equation correctly represents the thermal decomposition that occurs?

  1. CaCO₃ → CaO + CO
  2. CaCO₃ → CaO + CO₂
  3. CaCO₃ → Ca + CO₂ + O₂
  4. CaCO₃ + H₂O → Ca(OH)₂ + CO₂
Show answer & explanation
✓ Answer: BCaCO₃ → CaO + CO₂
Award 1 mark for the correct equation showing calcium carbonate decomposing to calcium oxide and carbon dioxide. A is incorrect — carbon monoxide (CO) is not produced; carbon dioxide (CO₂) is the correct product. C is incorrect — this equation is not balanced and calcium metal is not produced. D is incorrect — this equation shows the reaction of quicklime with water, not thermal decomposition.
Question 2 · 1 mark · Difficulty 1/3

A student carries out the test for carbon dioxide gas. Which reagent turns milky when carbon dioxide is bubbled through it?

  1. dilute hydrochloric acid
  2. limewater
  3. universal indicator
  4. aqueous sodium hydroxide
Show answer & explanation
✓ Answer: Blimewater
Award 1 mark for identifying limewater (calcium hydroxide solution) as the reagent used to test for carbon dioxide. The milky appearance is due to the formation of insoluble calcium carbonate. A is incorrect — dilute HCl does not turn milky with CO₂. C is incorrect — universal indicator shows pH changes, not specific gas tests. D is incorrect — sodium hydroxide solution does not produce a visible precipitate with CO₂.
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20 questions · 25 min · free

CIE IGCSE Chemistry: Carbonates FAQ

How many CIE IGCSE Chemistry questions on Carbonates are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on 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 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 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 Carbonates typically tested on CIE IGCSE Chemistry papers?
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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