100+ Free THPT Chemistry Practice Questions

Pass your Ky thi tot nghiep THPT - Mon Hoa hoc (Vietnam High School Graduation Chemistry Exam) exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

1 / 100

Question 1

Score: 0/0

When compounds of Group IA and IIA metals are heated in a flame, they give characteristic colours used to identify them. Which colour is produced by sodium?

brick-red

green

lilac (violet)

bright yellow

to track

Same family resources

Explore More Vietnam THPT National Graduation Exam

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

Vietnam THPT Exam - History

Practice Questions100 questions

2026 Statistics

Key Facts: THPT Chemistry Exam

A 50-minute, 28-question selected-response Chemistry paper (18 MCQ + 4 true/false clusters + 6 short-answer) taken as an elective in Vietnam's THPT graduation exam, scored out of 10 under the 2018 programme.

Sample THPT Chemistry Practice Questions

Try these sample questions to test your THPT Chemistry exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1An ester is the product of a carboxylic acid reacting with an alcohol, with elimination of water. What is the general formula of a saturated, unbranched, monocarboxylic ester (no rings, one ester group)?

A.CnH2n+2O (n >= 1)

B.CnH2nO2 (n >= 2)

C.CnH2n-2O2 (n >= 3)

D.CnH2nO (n >= 1)

Explanation: A saturated monoester such as HCOOCH3 or CH3COOC2H5 has the general formula CnH2nO2, the same as a saturated monocarboxylic acid because an ester and its parent acid are isomers (both contain one C=O and one C-O-C/C-O-H). For example methyl formate is C2H4O2 and ethyl acetate is C4H8O2.

2What is the IUPAC-style name commonly used in the Vietnamese Grade 12 programme for the ester CH3COOC2H5?

A.methyl acetate

B.ethyl formate

C.ethyl acetate (ethyl ethanoate)

D.methyl propanoate

Explanation: CH3COOC2H5 is formed from acetic acid (CH3COOH) and ethanol (C2H5OH); the alcohol part gives 'ethyl' and the acid part gives 'acetate' (ethanoate), so the name is ethyl acetate. It is a colourless liquid with a pleasant smell used as a solvent.

3When an ester is hydrolysed in a sodium hydroxide solution (saponification), the products are a salt of the carboxylic acid and an alcohol. What are the products of CH3COOC2H5 + NaOH?

A.CH3COOH and C2H5ONa

B.CH3OH and C2H5COONa

C.CH3COONa and CH3OH

D.CH3COONa and C2H5OH

Explanation: Saponification cleaves the C(=O)-O bond: the acyl group becomes the carboxylate salt CH3COONa (sodium acetate) and the alkoxy group is released as the alcohol C2H5OH (ethanol). The reaction is essentially irreversible because the carboxylate salt is stable.

4Triglycerides (fats and oils) are triesters of glycerol with long-chain fatty acids. Which statement about a fat such as tristearin (glyceryl tristearate) is correct?

A.It is a saturated fat that is usually solid at room temperature

B.It is a carbohydrate built from glucose units

C.It is fully soluble in water in all proportions

D.It contains no ester linkages

Explanation: Tristearin is the triester of glycerol with three stearic acid (C17H35COOH) chains, which are fully saturated; saturated triglycerides pack tightly and are solid at room temperature, like animal fats. Oils, by contrast, contain unsaturated chains and are liquid.

5Soap is made by boiling a fat with sodium hydroxide. The cleaning action comes from soap molecules having two ends. Which description is correct?

A.Two polar -COO-Na+ heads at both ends

B.A long nonpolar hydrocarbon tail (lipophilic) and a polar -COO-Na+ head (hydrophilic)

C.A long polar tail and a nonpolar head

D.Only a nonpolar hydrocarbon chain with no charged group

Explanation: A soap molecule such as sodium stearate C17H35COONa has a long nonpolar hydrocarbon tail that dissolves in grease and a polar carboxylate head (-COO-Na+) that is attracted to water. This dual nature lets soap emulsify oily dirt into micelles that wash away in water.

6Calculate the mass of ethyl acetate (CH3COOC2H5, M = 88 g/mol) formed when 0.1 mol of acetic acid reacts completely with excess ethanol (assume 100% conversion).

A.6.0 g

B.4.6 g

C.8.8 g

D.17.6 g

Explanation: The esterification CH3COOH + C2H5OH -> CH3COOC2H5 + H2O is 1:1, so 0.1 mol acid gives 0.1 mol ester. Mass = 0.1 mol x 88 g/mol = 8.8 g.

7Esterification between a carboxylic acid and an alcohol is a reversible reaction. According to the programme, which factor shifts the equilibrium toward producing more ester?

A.Adding extra water to the mixture

B.Lowering the temperature so the reaction stops

C.Removing the alcohol from the mixture

D.Using a sulfuric acid catalyst and removing water as it forms

Explanation: Concentrated H2SO4 acts as both a catalyst and a dehydrating agent; removing the water product shifts the equilibrium (Le Chatelier's principle) toward more ester. Using excess of one reactant also increases ester yield.

8An oil (unsaturated triglyceride) can be converted into a solid fat industrially. Which reaction achieves this hardening of oils?

A.Hydrogenation of the C=C double bonds using H2 and a Ni catalyst

B.Saponification with NaOH

C.Hydrolysis with dilute acid

D.Oxidation with KMnO4

Explanation: Liquid oils contain unsaturated fatty acid chains; adding hydrogen across the C=C bonds (H2, Ni catalyst, heat) converts them to saturated chains, raising the melting point so the product is solid (margarine). This is called fat hardening or hydrogenation.

9Which ester would produce a carboxylic acid and an aldehyde (not an alcohol) upon hydrolysis, a point often tested in the Grade 12 programme?

A.CH3COOC2H5 (ethyl acetate)

B.CH3COOCH=CH2 (vinyl acetate)

C.HCOOCH3 (methyl formate)

D.C2H5COOCH3 (methyl propanoate)

Explanation: Vinyl acetate CH3COOCH=CH2 hydrolyses to acetic acid and the enol CH2=CH-OH, which immediately rearranges (tautomerises) to acetaldehyde CH3CHO. Esters of enols therefore give an aldehyde or ketone rather than a stable alcohol.

10Saponifying a triglyceride yields soap plus one other organic product common to all triglycerides. What is that product?

A.ethanol

B.glucose

C.glycerol (propane-1,2,3-triol)

D.acetic acid

Explanation: Every triglyceride is an ester of the trihydric alcohol glycerol (propane-1,2,3-triol) with fatty acids; base hydrolysis releases glycerol along with the three carboxylate (soap) molecules. Glycerol is a sweet, viscous liquid used in cosmetics and medicines.

About the THPT Chemistry Exam

The Chemistry paper of Vietnam's High School Graduation Examination (Ky thi tot nghiep THPT) is a 50-minute, selected-response test of 28 questions taken by upper-secondary students who choose Chemistry as one of their two elective subjects alongside the compulsory Mathematics and Literature. From the 2025 session it follows the 2018 General Education Programme and a new three-part structure: 18 single-answer multiple-choice items, 4 true/false cluster questions of four statements each, and 6 short-answer numeric items, with no essay. About 90% of content is Grade 12, with roughly a 50:50 split between organic chemistry (esters and lipids, carbohydrates, nitrogen compounds, polymers) and inorganic/physical chemistry (electrochemistry, general metals, Group IA/IIA, transition metals and complexes), plus a small share of Grade 10-11 foundations. Results are scored out of 10 and combined with the candidate's three-year school GPA (50:50 from 2025) to determine graduation and for university admission.

Questions

100 scored questions

Time Limit

50 minutes (real Chemistry paper); this practice bank has 100 questions

Passing Score

Scored out of 10; graduation requires an overall graduation score of at least 5.0 and no subject at or below 1.0. From 2025 the graduation score is 50% exam plus 50% three-year school GPA.

Exam Fee

State-funded for enrolled students; free candidates pay a small provincial registration fee (historically about 35,000 VND per subject). No separate Chemistry-only fee. (Ministry of Education and Training (Bo Giao duc va Dao tao, MOET), via provincial Departments of Education and Training)

THPT Chemistry Exam Content Outline

11%

Ester, Lipid, Soap and Detergents

Esters and naming, esterification and saponification, triglycerides, hydrogenation of oils, soap and detergent action.

11%

Carbohydrates

Glucose and fructose, silver-mirror and Cu(OH)2 tests, sucrose, starch and the iodine test, cellulose, fermentation.

13%

Amines, Amino Acids, Peptides and Proteins

Amine classification and basicity, aniline, amino acid zwitterions, peptide bonds, proteins, biuret test and denaturation.

Polymers and Materials

Addition and condensation polymerisation, polyethylene, PVC, nylon, PET, rubber and vulcanisation.

13%

Electrochemical Cells and Electrolysis

Electrode potentials, galvanic cells and EMF, batteries and fuel cells, electrolysis and Faraday's law.

13%

General Properties of Metals

Metallic bonding, activity series, displacement and redox, metal extraction, alloys, corrosion and protection.

Group IA and IIA Elements

Alkali and alkaline-earth metals, reactions with water, flame tests, sodium and calcium compounds, hard water and lime.

11%

Transition Metals and Complexes

Variable oxidation states, coloured ions, complex ions and ligands, iron and copper chemistry, catalysis.

12%

Foundations and Exam-format Skills

Grade 10-11 acids/bases, pH, redox, rate and equilibrium, formula calculations, plus true/false and short-answer technique.

How to Pass the THPT Chemistry Exam

What You Need to Know

Passing score: Scored out of 10; graduation requires an overall graduation score of at least 5.0 and no subject at or below 1.0. From 2025 the graduation score is 50% exam plus 50% three-year school GPA.
Exam length: 100 questions
Time limit: 50 minutes (real Chemistry paper); this practice bank has 100 questions
Exam fee: State-funded for enrolled students; free candidates pay a small provincial registration fee (historically about 35,000 VND per subject). No separate Chemistry-only fee.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

THPT Chemistry Study Tips from Top Performers

1Prioritise Grade 12 content - about 90% of the paper - and split your revision roughly 50:50 between organic chemistry (esters, carbohydrates, nitrogen compounds, polymers) and inorganic chemistry (electrochemistry, metals, transition metals).

2Memorise the classic qualitative tests: silver-mirror for aldehydes/glucose, iodine for starch, biuret for proteins, and bromine water for phenol/aniline and alkenes - these recur every year.

3Drill the activity series and standard electrode potentials; be able to compute cell EMF as E(cathode) minus E(anode) and predict displacement and corrosion outcomes.

4Practise calculation items under time pressure: esterification and fermentation stoichiometry, Faraday's law for electrolysis, pH from [H+], and percentage composition, since the short-answer part demands exact numbers.

5Train specifically for the true/false clusters - judge each of the four statements independently, because partial correctness still earns partial marks.

6Learn the new electrochemistry chapter well (batteries, lithium-ion cells, fuel cells, electrolysis); it is emphasised under the 2018 programme and links to real-world contexts.

7Time yourself at roughly 1.5-2 minutes per item so you complete all 28 questions within the 50-minute limit, and leave a few minutes to check numeric short-answers.

Frequently Asked Questions

How long is the THPT Chemistry exam and how many questions are there?

The real Chemistry paper lasts 50 minutes and has 28 questions in three parts: 18 single-answer multiple-choice items, 4 true/false cluster questions (each with four statements), and 6 short-answer fill-in items. There is no essay.

What changed in the Chemistry exam from 2025?

The 2025 session was the first under the 2018 General Education Programme. The paper moved from 40 plain multiple-choice questions to a competency-based three-part format (single-answer MCQ, true/false clusters, short-answer), with more emphasis on application and real-world contexts.

Is Chemistry a compulsory subject in the THPT exam?

No. From 2025, candidates sit two compulsory subjects (Mathematics and Literature) plus two electives of their choice. Chemistry is one of the elective options, usually chosen by students aiming for science, engineering, medicine or pharmacy university programmes.

How is the Chemistry score used and what counts as passing?

Each subject is scored out of 10. For graduation, a candidate must have no subject scoring 1.0 or below and an overall graduation score of at least 5.0; from 2025 that score is 50% exam results and 50% the weighted three-year school GPA. The Chemistry mark is also used for university admission.

What content does the Chemistry exam cover?

Roughly 90% is Grade 12 content - esters and lipids, carbohydrates, nitrogen compounds, polymers, electrochemistry, general metals, Group IA/IIA elements and transition metals/complexes - with about 10% from Grade 10-11 foundations. Organic and inorganic chemistry are weighted roughly 50:50.

How is the true/false cluster question scored?

Each true/false question presents four statements that you mark true or false. Scoring is graduated: getting one statement right earns 0.1 point, two right 0.25, three right 0.5 and all four right 1.0 point, rewarding partial understanding.

Is a calculator or periodic table allowed?

A non-programmable calculator from the approved list is permitted, and a periodic table of the elements is provided with the paper. Memorising atomic masses is therefore less critical than understanding reactions and calculations.

100+ Free THPT Chemistry Practice Questions

Vietnam THPT Exam - Chemistry