Which pair of reactants would produce the salt copper(II) sulfate by a direct reaction?

Q: How do I try a free CIE Co-ordinated Science (Double Award) 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 CIE IGCSE Co-ordinated Science (Double Award) 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 CIE Co-ordinated Science (Double Award) 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 Co-ordinated Science (Double Award) questions aligned to the CIE IGCSE syllabus?

Every question is written against the published CIE IGCSE Co-ordinated Science (Double Award) 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 CIE 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 pair of reactants would produce the salt copper(II) sulfate by a direct reaction?

Accepted Answer

Copper(II) oxide and sulfuric acid — Copper(II) oxide reacts with sulfuric acid to produce copper(II) sulfate, water, and no other salt — the sulfate ion comes from sulfuric acid and the copper(II) from the oxide. Options A and B would produce chloride and nitrate salts respectively. Option D also produces copper(II) sulfate but uses a hydroxide rather than an oxide as stated.

Answer

Copper(II) carbonate and nitric acid

Answer

Copper(II) oxide and sulfuric acid

Answer

Copper(II) hydroxide and sulfuric acid

Answer

Copper(II) oxide and hydrochloric acid

One real Co-ordinated Science (Double Award) question.No signup. 30 seconds.

One real Co-ordinated Science (Double Award) question.
No signup. 30 seconds.