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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 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.
Q2 · Difficulty 1/3

Which of the following monomers undergoes addition polymerisation to form poly(propene)?

  1. CH3CH2CH3
  2. CH2=CHCH3
  3. HOOC–COOH
  4. CH2=CH2
Show answer & explanation
✓ Answer: B — CH2=CHCH3
Propene (CH2=CHCH3) contains a C=C double bond and undergoes addition polymerisation to form poly(propene). Option B is ethene, which forms poly(ethene). Option C is propane, a saturated alkane with no double bond and cannot polymerise. Option D is a dicarboxylic acid used in condensation polymerisation, not addition polymerisation.
Q3 · Difficulty 1/3

What is bauxite?

  1. An iron ore
  2. The ore from which aluminium is extracted
  3. A type of steel
  4. A fossil fuel
Show answer & explanation
✓ Answer: B — The ore from which aluminium is extracted
Bauxite is the main ore of aluminium and is of great economic importance to the Caribbean, especially Jamaica and Guyana.
Q4 · Difficulty 1/3

At a bauxite processing plant in Jamaica, aluminium is extracted by electrolysis of molten aluminium oxide. At which electrode is aluminium produced?

  1. Anode
  2. Cathode
  3. Both electrodes
  4. Neither electrode
Show answer & explanation
✓ Answer: B — Cathode
Award 1 mark for identifying that aluminium (a metal) is produced at the cathode by reduction. A is incorrect — oxygen is produced at the anode by oxidation. C is incorrect — different products form at each electrode. D is incorrect — aluminium is definitely produced during electrolysis.
Q5 · Difficulty 1/3

Which gas is used in lights and is very unreactive?

  1. neon (a noble gas)
  2. chlorine
  3. sodium
  4. oxygen
Show answer & explanation
✓ Answer: A — neon (a noble gas)
Neon, a noble gas, is unreactive and used in lighting.
Q6 · Difficulty 1/3

Which of the following elements is classified as a noble gas?

  1. Argon (Ar)
  2. Oxygen (O)
  3. Nitrogen (N)
  4. Chlorine (Cl)
Show answer & explanation
✓ Answer: A — Argon (Ar)
Argon (Ar) is in Group 0 (Group 18) and is a noble gas with a full outer electron shell, making it chemically unreactive. Nitrogen, chlorine, and oxygen are non-metals that do react chemically to form compounds — they are not noble gases.
Q7 · Difficulty 1/3

Which indicator turns red in acid and blue in alkali?

  1. Phenolphthalein
  2. Litmus
  3. Methyl orange
  4. Universal indicator
Show answer & explanation
✓ Answer: B — Litmus
Litmus is red in acidic solutions and blue in alkaline solutions. It is one of the simplest indicators.
Q8 · Difficulty 1/3

Ethene reacts with hydrogen gas in the presence of a nickel catalyst. What is the product of this reaction?

  1. Methane
  2. Ethane
  3. Propane
  4. Ethanol
Show answer & explanation
✓ Answer: B — Ethane
When ethene (CH₂=CH₂) undergoes hydrogenation with H₂ and a nickel catalyst, hydrogen adds across the double bond to form ethane (CH₃CH₃). This is an addition reaction. The catalyst lowers the activation energy but 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.