Calcium chloride has the formula CaCl₂. Which statement correctly explains why two chloride ions are needed for every calcium ion?

Q: How do I try a free CXC Chemistry 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 Chemistry 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 Chemistry 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 Chemistry questions aligned to the CXC CSEC syllabus?

Every question is written against the published CXC CSEC Chemistry 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

Calcium chloride has the formula CaCl₂. Which statement correctly explains why two chloride ions are needed for every calcium ion?

Accepted Answer

Calcium loses two electrons and each chloride ion gains one electron to balance charge — Calcium (Group 2) loses two electrons to form Ca²⁺. Each chlorine atom can only accept one electron to form Cl⁻, so two chloride ions are required to accommodate the two electrons transferred, maintaining electrical neutrality.

Answer

Calcium is larger than chlorine so it needs two chloride ions to surround it

Answer

Calcium has two more protons than chlorine so two chloride ions are needed

Answer

Two chlorine atoms share electrons with one calcium atom

Answer

Calcium loses two electrons and each chloride ion gains one electron to balance charge

One real Chemistry question.No signup. 30 seconds.

One real Chemistry question.
No signup. 30 seconds.