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Edexcel · GCSE · Chemistry

Chemical tests: anions, gases and organic compounds
Practice Questions

20 Edexcel GCSE Chemistry questions on Chemical tests: anions, gases and organic compounds, each with instant feedback and a full examiner-style mark scheme.

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Question 1 · 1 mark · Difficulty 1/3

A student adds dilute hydrochloric acid to a white powder. A colourless gas is produced that turns limewater milky. Which anion is present in the powder?

  1. A: Sulfate ion (SO₄²⁻)
  2. B: Carbonate ion (CO₃²⁻)
  3. C: Chloride ion (Cl⁻)
  4. D: Nitrate ion (NO₃⁻)
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✓ Answer: BB: Carbonate ion (CO₃²⁻)
Carbonate ions react with dilute hydrochloric acid to produce carbon dioxide gas, which turns limewater milky (forms a white precipitate of calcium carbonate). Sulfate ions produce a white precipitate with barium chloride, not a gas with HCl. Chloride ions are detected using silver nitrate solution. Nitrate ions do not produce a gas with dilute HCl.
Question 2 · 1 mark · Difficulty 1/3

Which reagent is used to test for sulfate ions (SO₄²⁻) in solution, and what is the positive result?

  1. B: Barium chloride solution; white precipitate forms
  2. C: Barium chloride solution; yellow precipitate forms
  3. D: Dilute hydrochloric acid; colourless gas produced
  4. A: Silver nitrate solution; white precipitate forms
Show answer & explanation
✓ Answer: AB: Barium chloride solution; white precipitate forms
Acidified barium chloride solution is added to test for sulfate ions; a white precipitate of barium sulfate (BaSO₄) confirms their presence. Silver nitrate is used for halide ions, not sulfates. Barium chloride does not produce a yellow precipitate with sulfates. Dilute HCl produces a gas with carbonates, not sulfates.
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Edexcel GCSE Chemistry: Chemical tests: anions, gases and organic compounds FAQ

How many Edexcel GCSE Chemistry questions on Chemical tests: anions, gases and organic compounds are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Chemical tests: anions, gases and organic compounds for Edexcel GCSE 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 Edexcel 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 Edexcel GCSE 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 Chemical tests: anions, gases and organic compounds practice with other Chemistry topics or even switch to a totally different Edexcel 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 Chemical tests: anions, gases and organic compounds questions aligned to the official Edexcel GCSE Chemistry syllabus?
Every question is written against the published Edexcel GCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real Edexcel 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 Edexcel.
How is Chemical tests: anions, gases and organic compounds typically tested on Edexcel GCSE Chemistry papers?
Chemical tests: anions, gases and organic compounds appears across multiple question types on real Edexcel GCSE 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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