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Exam Review

Key Facts: CAPE Chemistry Unit 2 Exam

45 questions

Paper 01 consists of 45 compulsory multiple-choice items, 15 per module

CXC CAPE Chemistry syllabus

1 hr 30 mins

Duration of the Paper 01 multiple-choice examination

CXC CAPE Chemistry syllabus

40%

Weight of Paper 01 toward the overall CAPE Unit 2 grade

CXC CAPE Chemistry syllabus

3 modules

Carbon Compounds, Analytical Methods, and Industry & Environment

CXC CAPE Chemistry syllabus

Grades I–VII

Overall CAPE certification grading scale, with Grade I as highest

Caribbean Examinations Council

Grades I–V

Recognized passing grades across tertiary institutions in the Caribbean

Caribbean Examinations Council

BBD$69.50

Official CXC 2026 subject fee per Unit for member territories

Caribbean Examinations Council Scale of Fees

98

Free original practice questions provided in this study bank

OpenExamPrep

CAPE Chemistry Unit 2 (Chemical Principles and Applications II) is administered by the Caribbean Examinations Council (CXC) for post-16 students across the Caribbean. Paper 01 consists of 45 compulsory multiple-choice items—15 per module—administered in 1 hour 30 minutes and weighted at 40% of the final Unit grade. Results are reported on a seven-point scale (Grades I–VII). This 98-question practice bank provides independent multiple-choice preparation covering organic functional groups and mechanisms, quantitative analytical methods, spectroscopy, chromatography, industrial chemical processes, and environmental chemistry with worked explanations.

Sample CAPE Chemistry Unit 2 Practice Questions

Try these sample questions to review concepts for the CAPE Chemistry Unit 2 exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 98+ question experience with AI tutoring.

1What is the hybridization of the carbon atoms in an ethyne (HC≡CH) molecule, and what is the H-C-C bond angle?
A.sp hybridization with a bond angle of 180°
B.sp² hybridization with a bond angle of 120°
C.sp³ hybridization with a bond angle of 109.5°
D.sp³d hybridization with a bond angle of 90°
Explanation: In ethyne, each carbon atom forms two σ bonds (one to hydrogen and one to carbon) and two unhybridized 2p orbitals overlap sideways to form two π bonds. Mixing one 2s and one 2p orbital gives linear sp hybridization with an H-C-C bond angle of 180°.
2Why does carbon exhibit an extensive ability to undergo catenation compared to silicon?
A.The C-C single bond enthalpy (347 kJ/mol) is much greater than the Si-Si bond enthalpy (226 kJ/mol).
B.Silicon atoms lack available p orbitals necessary to form covalent bonds with other silicon atoms.
C.Carbon possesses empty d orbitals in its valence shell that stabilize long chains.
D.The Si-O bond is significantly weaker than the Si-Si bond, promoting silicon chain formation.
Explanation: Catenation is the ability of an element to form covalent bonds with other atoms of the same element into long chains or rings. The C-C single bond is exceptionally strong (347 kJ/mol) due to effective orbital overlap between small second-period atoms, whereas the Si-Si bond is substantially weaker (226 kJ/mol) and Si-O bonds (466 kJ/mol) are thermodynamically favored.
3What is the systematic IUPAC name for the compound CH₃-CH(CH₃)-CH=CH-CH₃?
A.4-methylpent-2-ene
B.2-methylpent-3-ene
C.4-methylpent-3-ene
D.2-methylpent-2-ene
Explanation: The longest continuous carbon chain containing the double bond has five carbons (pentene). Numbering starts from the end nearest the double bond: C1-C2=C3-C4-C5, placing the double bond at carbon-2 and the methyl substituent at carbon-4. Thus, the correct IUPAC name is 4-methylpent-2-ene.
4Which pair of organic compounds represents functional group isomerism?
A.Propanal (CH₃CH₂CHO) and propanone (CH₃COCH₃)
B.Butan-1-ol (CH₃CH₂CH₂CH₂OH) and butan-2-ol (CH₃CH₂CH(OH)CH₃)
C.Pentane (CH₃(CH₂)₃CH₃) and 2-methylbutane (CH₃CH(CH₃)CH₂CH₃)
D.cis-But-2-ene and trans-but-2-ene
Explanation: Functional group isomers have the same molecular formula but different functional groups. Propanal (an aldehyde) and propanone (a ketone) both have the molecular formula C₃H₆O but belong to completely different homologous series with distinct chemical reactivities.
5Which compound is capable of existing as a pair of cis-trans (geometrical) isomers?
A.1,2-dichloroethene
B.1,1-dichloroethene
C.Propene
D.2-methylbut-2-ene
Explanation: For geometrical (cis-trans) isomerism to occur around a C=C double bond, there must be restricted rotation and each carbon atom of the double bond must be attached to two different groups. In 1,2-dichloroethene (CHCl=CHCl), each carbon carries -H and -Cl, allowing cis (both Cl on same side) and trans (Cl on opposite sides) forms.
6Which compound contains a chiral centre and rotates plane-polarized light in polarimetry?
A.2-chlorobutane
B.1-chlorobutane
C.2-chloropropane
D.Propan-2-ol
Explanation: A chiral centre is a carbon atom bonded to four distinctly different atoms or groups of atoms. In 2-chlorobutane (CH₃-C*H(Cl)-CH₂-CH₃), carbon-2 is bonded to -H, -Cl, -CH₃, and -CH₂CH₃, making it asymmetric and optical active (capable of existing as non-superimposable mirror-image enantiomers).
7What occurs during the homolytic fission of a covalent bond?
A.The bonding electron pair divides equally, giving one electron to each departing atom to form free radicals.
B.Both bonding electrons are transferred to the more electronegative atom, forming a cation and an anion.
C.A coordinate covalent bond is formed through donation of a lone pair from a nucleophile.
D.A carbocation intermediate is produced alongside a leaving halide ion.
Explanation: In homolytic fission, a covalent bond breaks symmetrically such that each of the two bonded atoms retains one of the shared bonding electrons. This produces uncharged reactive species containing an unpaired valence electron, known as free radicals (e.g. Cl-Cl -> 2 Cl•).
8What is the primary role of ultraviolet (UV) light in the chlorination of methane?
A.It supplies the activation energy to cause homolytic fission of the Cl-Cl bond in the initiation step.
B.It causes heterolytic fission of the C-H bond in methane to produce a carbanion.
C.It acts as a homogeneous catalyst that coordinates to methane to weaken the C-H bond.
D.It terminates the chain reaction by exciting methyl radicals into a stable state.
Explanation: The initiation step of free-radical chlorination requires homolytic cleavage of the chlorine molecule: Cl₂ + hν -> 2 Cl•. The Cl-Cl bond enthalpy (242 kJ/mol) is low enough to be broken by absorbing photons of UV light, whereas the C-H bond (413 kJ/mol) is too strong to be cleaved directly by this wavelength.
9Which reaction represents a propagation step in the free-radical chlorination of methane?
A.•CH₃ + Cl₂ → CH₃Cl + Cl•
B.Cl₂ → 2 Cl•
C.•CH₃ + Cl• → CH₃Cl
D.•CH₃ + •CH₃ → C₂H₆
Explanation: A propagation step consumes one radical and generates a new radical, allowing the chain reaction to continue without changing the net number of free radicals. In this step, the methyl radical reacts with a molecular chlorine molecule to produce chloromethane and regenerate a chlorine radical.
10Which order correctly arranges carbocations in order of decreasing thermodynamic stability?
A.(CH₃)₃C⁺ > (CH₃)₂CH⁺ > CH₃CH₂⁺ > CH₃⁺
B.CH₃⁺ > CH₃CH₂⁺ > (CH₃)₂CH⁺ > (CH₃)₃C⁺
C.(CH₃)₂CH⁺ > (CH₃)₃C⁺ > CH₃CH₂⁺ > CH₃⁺
D.CH₃CH₂⁺ > (CH₃)₂CH⁺ > (CH₃)₃C⁺ > CH₃⁺
Explanation: Carbocation stability follows the order tertiary (3°) > secondary (2°) > primary (1°) > methyl. Alkyl groups have a positive inductive effect (+I), pushing electron density towards the positively charged carbon atom and dispersing the positive charge over a larger volume, alongside hyperconjugation stabilization.

About the CAPE Chemistry Unit 2 Exam

CAPE Chemistry Unit 2, titled Chemical Principles and Applications II, is the second discrete certifiable unit of the Caribbean Examinations Council's Advanced Proficiency Examination in Chemistry. It encompasses three modules: Module 1 (The Chemistry of Carbon Compounds), Module 2 (Analytical Methods and Separation Techniques), and Module 3 (Industry and the Environment). Assessment comprises Paper 01 (45 MCQs, 15 per Module, 40%), Paper 02 (three compulsory structured essays, 40%), and laboratory and research-project SBA (20%). Private candidates took practical Paper 032 instead of SBA in 2026; from May–June 2027, all Chemistry candidates complete SBA. This qualification provides advanced pre-university grounding for degrees in chemistry, chemical engineering, medicine, pharmacy, and environmental sciences.

Exam sponsor: Caribbean Examinations Council (CXC). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Paper 01: 45 compulsory MCQs, 15 per Module (40%). Paper 02: three compulsory structured essays, one per Module (40%). SBA: laboratory exercises and a research project (20%); a project completed in another CAPE Science Unit may supply the transferable project marks. Private Paper 032 was available in 2026; all Chemistry candidates complete SBA from May–June 2027.

Time Limit

Paper 01: 1 hour 30 minutes. Paper 02: 2 hours 30 minutes. Private Paper 032: 2 hours in 2026; withdrawn for Chemistry from May–June 2027.

Passing Score

CXC does not publish numerical grade cut-scores. CAPE reports overall grades I–VII (Grade I highest) based on the composite mark from Papers 01, 02, and SBA (or private Paper 032 in 2026). Grades I–V are generally accepted as passes.

Exam / Certification Fees

From May–June 2026, CXC lists BBD$69.50 per CAPE Unit plus BBD$48.50 candidate entry for member territories; local fees may apply. Confirm the total with your Local Registrar.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

33%

Module 1: The Chemistry of Carbon Compounds

Covers organic chemistry principles: nomenclature, catenation, hybridization, structural and stereoisomerism, bond fission, reaction types, alkanes and alkenes, benzene and electrophilic substitution, alcohols, phenols, carbonyl compounds, carboxylic acids and derivatives, amines, amino acids, and polymers.

33%

Module 2: Analytical Methods and Separation Techniques

Covers quantitative analysis and measurement: uncertainties, precision, accuracy, titrimetric analysis (acid-base, redox, and back titrations), gravimetric analysis, spectroscopic methods (UV-Visible, Infrared, and Mass Spectrometry), and separation methods (solvent extraction, TLC, column, and gas-liquid chromatography).

34%

Module 3: Industry and the Environment

Covers chemical industrial operations and environmental science: industrial plant siting, safety protocols, green chemistry principles, manufacture of aluminium, chlor-alkali products, ammonia, sulfuric acid, petroleum refining, ethanol production, atmospheric chemistry and air pollution, water pollution, and solid waste management.

Preparing for the CAPE Chemistry Unit 2 Exam

What You Need to Know

  • Passing score: CXC does not publish numerical grade cut-scores. CAPE reports overall grades I–VII (Grade I highest) based on the composite mark from Papers 01, 02, and SBA (or private Paper 032 in 2026). Grades I–V are generally accepted as passes.
  • Assessment: Paper 01: 45 compulsory MCQs, 15 per Module (40%). Paper 02: three compulsory structured essays, one per Module (40%). SBA: laboratory exercises and a research project (20%); a project completed in another CAPE Science Unit may supply the transferable project marks. Private Paper 032 was available in 2026; all Chemistry candidates complete SBA from May–June 2027.
  • Time limit: Paper 01: 1 hour 30 minutes. Paper 02: 2 hours 30 minutes. Private Paper 032: 2 hours in 2026; withdrawn for Chemistry from May–June 2027.
  • Exam / certification fees: From May–June 2026, CXC lists BBD$69.50 per CAPE Unit plus BBD$48.50 candidate entry for member territories; local fees may apply. Confirm the total with your Local Registrar. Official sources

Using Our Practice Resources

  • Work through all 98 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CAPE Chemistry Unit 2: Suggested Study Strategy

1Divide revision time equally across the three modules: Paper 01 allocates exactly 15 questions to Module 1, 15 to Module 2, and 15 to Module 3.
2Master organic reaction mechanisms and conditions: practise drawing electrophilic addition, electrophilic substitution, nucleophilic addition, and nucleophilic substitution mechanisms with curved arrows showing electron pair movement.
3Drill quantitative analytical calculations: ensure fluency in back titrations, redox stoichiometry (e.g. manganate and thiosulfate), gravimetric factors, and uncertainty propagation under exam timing.
4Learn key spectroscopic signatures: memorize characteristic infrared absorption frequencies (e.g. broad O-H stretch at 3200-3600 cm⁻¹, sharp C=O stretch at 1680-1750 cm⁻¹) and mass spectrometry fragmentation patterns.
5Understand the economic, kinetic, and environmental compromises in industrial processes like the Haber and Contact processes, and memorize the role of cryolite in aluminium extraction.
6Pace yourself during Paper 01: with 45 questions in 90 minutes, allocate an average of two minutes per question, leaving time to review calculation-heavy items.

Frequently Asked Questions

How many questions are on CAPE Chemistry Unit 2 Paper 01?

Paper 01 consists of 45 compulsory multiple-choice questions, exactly 15 questions from each of the three Modules, answered in 1 hour 30 minutes. Each question has four options.

What are the three modules in CAPE Chemistry Unit 2?

Module 1 is The Chemistry of Carbon Compounds, Module 2 is Analytical Methods and Separation Techniques, and Module 3 is Industry and the Environment. Each Module is covered in Papers 01 and 02; practical work forms part of the SBA.

What is the passing score for CAPE Chemistry Unit 2?

CXC does not publish a single percentage pass mark. Results are awarded on a 7-point scale from Grade I (highest) to Grade VII based on combined performance across all examination components. Grades I to V are considered passing grades.

How is the practical component assessed for private candidates?

In 2026, private Paper 032 lasted two hours and included a practical task, data analysis and planning/design. From May–June 2027, Chemistry no longer offers Paper 032; private candidates must complete SBA. Contact the Local Registrar for arrangements.

How much does it cost to register for CAPE Chemistry Unit 2 in 2026?

From May–June 2026, CXC sets the regional subject fee at BBD$69.50 per Unit plus a BBD$48.50 candidate entry fee for member territories. Individual territories and private exam centres may add local administrative charges.

Are these official CXC examination questions?

These are independent English-language MCQ study questions by OpenExamPrep for CAPE Chemistry Unit 2. They are not official CXC questions or an official-format simulation, and do not replace structured writing, laboratory work or practical assessment. Official past papers are available from the CXC Store.