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Preparation of soluble and insoluble salts
Practice Questions

20 CIE IGCSE Chemistry questions on Preparation of soluble and insoluble salts, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Preparation of soluble and insoluble salts

Question 1 · 1 mark · Difficulty 1/3

In a school laboratory in Singapore, students are preparing copper(II) sulfate from copper(II) carbonate and dilute sulfuric acid. The equation for the reaction is: CuCO₃ + H₂SO₄ → CuSO₄ + H₂O + CO₂ Which observation indicates that the reaction is still occurring?

  1. The solution turns blue
  2. Bubbles of gas are produced
  3. The copper(II) carbonate sinks to the bottom
  4. The temperature of the mixture increases
Show answer & explanation
✓ Answer: B — Bubbles of gas are produced
Award 1 mark for identifying gas production as evidence of ongoing reaction. Carbon dioxide gas is produced during the reaction, so effervescence indicates the reaction is continuing. A is incorrect — the blue colour indicates product formation but not that reaction is still occurring. C is incorrect — sinking is not evidence of reaction. D is incorrect — while the reaction may be exothermic, temperature change is not the primary indicator for this reaction.
Question 2 · 1 mark · Difficulty 2/3

A student wants to prepare a pure, dry sample of copper(II) sulfate crystals from copper(II) oxide and dilute sulfuric acid. Which method should the student use?

  1. Add excess copper(II) oxide to the acid, filter, then evaporate the filtrate to dryness
  2. Add excess copper(II) oxide to the acid, filter, then heat the filtrate until crystals start to form and allow to cool
  3. Add copper(II) oxide until the reaction stops, then evaporate all the water
  4. Mix equal volumes of copper(II) oxide and sulfuric acid, then filter the mixture
Show answer & explanation
✓ Answer: B — Add excess copper(II) oxide to the acid, filter, then heat the filtrate until crystals start to form and allow to cool
Award 1 mark for identifying the correct procedure of adding excess insoluble base, filtering, and crystallising. A is incorrect — evaporating to dryness would produce anhydrous powder, not crystals, and may cause decomposition. C is incorrect — evaporating all water produces anhydrous copper(II) sulfate, not hydrated crystals. D is incorrect — 'equal volumes' is not a valid method for ensuring complete reaction and excess solid cannot be measured by volume.
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CIE IGCSE Chemistry: Preparation of soluble and insoluble salts FAQ

How many CIE IGCSE Chemistry questions on Preparation of soluble and insoluble salts are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Preparation of soluble and insoluble salts 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 Preparation of soluble and insoluble salts 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 Preparation of soluble and insoluble salts 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 Preparation of soluble and insoluble salts typically tested on CIE IGCSE Chemistry papers?
Preparation of soluble and insoluble salts 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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