Which chemical equation correctly represents the carbonation of limestone?

Q: How do I try a free CXC Geography question?

Just tap any of the four options on this page — no signup, no card, nothing to install. You'll see the correct answer and a full mark-scheme-style explanation within a second. Each visit shows a fresh randomly-picked question from the live CXC CSEC Geography bank, so you can keep refreshing to try different ones before deciding whether to create a free account for daily access.

Q: Is Kramizo really free for CXC Geography students?

Yes — completely free. Every student gets 45 questions a day on the free plan, across any board and any subject, with no card required and no trial countdown. Kramizo's optional Pro plan removes the daily cap and adds analytics, but the free plan is genuinely free forever. We make money from the small percentage of students who choose to upgrade — not from selling data or ads.

Q: Are the Geography questions aligned to the CXC CSEC syllabus?

Every question is written against the published CXC CSEC Geography syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real CXC past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

Which chemical equation correctly represents the carbonation of limestone?

Accepted Answer

Cite is CO₃ + H₂O + CO₂ → Ca(HCO₃)₂ — Award 1 mark for the correct carbonation equation showing formation of calcium bicarbonate. A is incorrect — this is not a valid chemical equation. C is incorrect — this shows reaction with hydrochloric acid, not carbonation. D is incorrect — this represents thermal decomposition.

Answer

ite + H₂O →ite calcium hydroxide

Answer

CaCO₃ → CaO + CO₂

Answer

Cite is CO₃ + H₂O + CO₂ → Ca(HCO₃)₂

Answer

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

One real Geography question.No signup. 30 seconds.

One real Geography question.
No signup. 30 seconds.