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CXC · CSEC · Chemistry

Free CXC CSEC Chemistry
Practice Paper

8 mixed-difficulty practice questions in the style of real CXC CSEC papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.

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What the real CXC CSEC Chemistry paper looks like

Paper 1 (Section A)
60 multiple-choice questions, 1 mark each. 75 minutes. Tests knowledge across the whole syllabus.
Paper 2
Structured short-answer + 1 extended response question. Section A is compulsory; Section B has a choice. Approximately 2 hours 10 minutes.
School-Based Assessment (SBA)
Coursework component graded by the teacher, externally moderated. Worth ~20-30% of the final grade depending on subject.
Total exam time: ~3.5 hours across Paper 1 and Paper 2 sittings.
Grading: Grades: I (highest) to VI (lowest). A grade of III or above is typically required for further study.

Mini practice paper: 8 questions

Mixed-difficulty questions from across the Chemistry syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

What pH value indicates a neutral substance?

  1. pH 0
  2. pH 7
  3. pH 14
  4. pH 1
Show answer & explanation
✓ Answer: B — pH 7
pH 7 is neutral. Values below 7 are acidic (the lower the number, the stronger the acid) and above 7 are alkaline.
Q2 · Difficulty 1/3

A student adds a few drops of universal indicator to dilute hydrochloric acid and then slowly adds sodium hydroxide solution. What colour would the indicator show at the point of exact neutralisation?

  1. Red
  2. Blue
  3. Green
  4. Orange
Show answer & explanation
✓ Answer: C — Green
Universal indicator turns green at a neutral pH of 7, which is the point of exact neutralisation between a strong acid and a strong alkali. Red indicates a strongly acidic solution, blue indicates a strongly alkaline solution, and orange indicates a weakly acidic solution. Students commonly confuse blue (alkaline) with the neutral endpoint.
Q3 · Difficulty 1/3

What is organic chemistry?

  1. The study of all chemicals
  2. The chemistry of carbon-containing compounds
  3. The study of metals
  4. The study of acids and bases
Show answer & explanation
✓ Answer: B — The chemistry of carbon-containing compounds
Organic chemistry is the branch of chemistry dealing with carbon-containing compounds and their reactions. Carbon can form 4 bonds and long chains.
Q4 · Difficulty 1/3

Which of the following salts is INSOLUBLE in water?

  1. Sodium sulfate
  2. Potassium nitrate
  3. Barium sulfate
  4. Ammonium chloride
Show answer & explanation
✓ Answer: C — Barium sulfate
Barium sulfate is an insoluble salt. Sodium sulfate, potassium nitrate, and ammonium chloride are all soluble in water. Knowledge of solubility rules is essential for choosing the correct method of salt preparation.
Q5 · Difficulty 1/3

What is corrosion?

  1. Melting of a metal
  2. The gradual destruction of a metal by chemical reaction with its environment
  3. Dissolving a metal in acid
  4. Heating a metal
Show answer & explanation
✓ Answer: B — The gradual destruction of a metal by chemical reaction with its environment
Corrosion is the chemical reaction between a metal and substances in its environment (e.g. oxygen, water). Rusting of iron is a common example.
Q6 · Difficulty 1/3

What are fossil fuels?

  1. Fuels made from recycled materials
  2. Fuels formed from the remains of ancient organisms over millions of years
  3. Fuels made from plants grown today
  4. Nuclear fuels
Show answer & explanation
✓ Answer: B — Fuels formed from the remains of ancient organisms over millions of years
Fossil fuels (coal, oil, natural gas) formed from the decomposition of ancient organisms under heat and pressure over millions of years. They are non-renewable.
Q7 · Difficulty 1/3

The noble gas present in the greatest proportion in dry air is:

  1. A. Helium
  2. B. Neon
  3. C. Krypton
  4. D. Argon
Show answer & explanation
✓ Answer: D — D. Argon
Argon is the most abundant noble gas in the atmosphere, making up about 0.9% of dry air. Helium, neon, and krypton are present in much smaller trace amounts.
Q8 · Difficulty 1/3

What is a catalyst?

  1. A substance consumed in the reaction
  2. A substance that speeds up a reaction without being used up
  3. A type of acid
  4. A product of the reaction
Show answer & explanation
✓ Answer: B — A substance that speeds up a reaction without being used up
A catalyst increases the rate of reaction by providing an alternative pathway with lower activation energy. It is not consumed in the reaction.
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CXC CSEC Chemistry FAQ

What does the CXC CSEC Chemistry exam look like?
The CXC CSEC Chemistry exam is structured across 3 components. Paper 1 (Section A): 60 multiple-choice questions, 1 mark each. 75 minutes. Tests knowledge across the whole syllabus. Paper 2: Structured short-answer + 1 extended response question. Section A is compulsory; Section B has a choice. Approximately 2 hours 10 minutes. School-Based Assessment (SBA): Coursework component graded by the teacher, externally moderated. Worth ~20-30% of the final grade depending on subject. Total exam time: ~3.5 hours across Paper 1 and Paper 2 sittings.
Can I download a free CXC CSEC Chemistry past paper?
Real CXC past papers are published directly by CXC on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is CXC CSEC Chemistry graded?
Grades: I (highest) to VI (lowest). A grade of III or above is typically required for further study. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.