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HomeCXC CSEC ChemistryAlkanes: Properties, Reactions and Uses
CXC · CSEC · Chemistry

Alkanes: Properties, Reactions and Uses
Practice Questions

12 CXC CSEC Chemistry questions on Alkanes: Properties, Reactions and Uses, each with instant feedback and a full examiner-style mark scheme.

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Question 1 · 1 mark · Difficulty 1/3

Methane reacts with chlorine in the presence of ultraviolet light. What type of reaction is this?

  1. addition
  2. substitution
  3. polymerisation
  4. oxidation
Show answer & explanation
✓ Answer: Bsubstitution
Award 1 mark for identifying the reaction as substitution. A is incorrect — addition reactions occur with unsaturated compounds, not alkanes. C is incorrect — polymerisation involves joining many small molecules together. D is incorrect — while combustion is oxidation, the reaction with chlorine in UV light is substitution where hydrogen atoms are replaced by chlorine atoms.
Question 2 · 1 mark · Difficulty 1/3

What is the general formula for alkanes?

  1. CnH2n
  2. CnH2n+2
  3. CnH2n-2
  4. CnH2n+1
Show answer & explanation
✓ Answer: BCnH2n+2
Award 1 mark for identifying the correct general formula for alkanes. A is incorrect — CnH2n is the general formula for alkenes. C is incorrect — CnH2n-2 is the general formula for alkynes. D is incorrect — CnH2n+1 represents an alkyl group, not an alkane molecule.
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CXC CSEC Chemistry: Alkanes: Properties, Reactions and Uses FAQ

How many CXC CSEC Chemistry questions on Alkanes: Properties, Reactions and Uses are there on Kramizo?
Kramizo currently has 12 exam-board-aligned practice questions on Alkanes: Properties, Reactions and Uses for CXC CSEC 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 CXC 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 CXC CSEC 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 Alkanes: Properties, Reactions and Uses practice with other Chemistry topics or even switch to a totally different CXC 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 Alkanes: Properties, Reactions and Uses questions aligned to the official CXC CSEC Chemistry syllabus?
Every question is written against the published CXC CSEC Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC 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 CXC.
How is Alkanes: Properties, Reactions and Uses typically tested on CXC CSEC Chemistry papers?
Alkanes: Properties, Reactions and Uses appears across multiple question types on real CXC CSEC 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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