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100+ Free Bulgaria DZI Chemistry Practice Questions

Prepare for the Bulgaria State Matriculation Examination in Chemistry and Environmental Protection (Държавен зрелостен изпит по химия и опазване на околната среда) exam with instant access — no signup required.

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2026 Statistics

Key Facts: Bulgaria DZI Chemistry Exam

4 astronomical hours

Official written DZI Chemistry duration (240 minutes)

МОН, учебно-изпитна програма for ДЗИ по химия и опазване на околната среда

30 / 100 points

Pass threshold: Fair / Среден 3.00 on the MON unified scale

Наредба № 11 от 1.09.2016 г. за оценяване на резултатите от обучението на учениците

22 May 2026, 08:30

2026 second compulsory DZI sitting (profile-subject paper, including Chemistry ПП)

МОН, DZI timetable for the 2025–2026 school year

ООП vs ПП

Separate general-education and profiled-preparation papers under the Chemistry УИП/ДОС

МОН, DZI Chemistry exam materials and УИП

English MCQ study aid

This bank is not an official translation and does not simulate the live Bulgarian paper

OpenExamPrep practice-bank disclosure

Free 100-question English MCQ study bank for Bulgaria DZI Chemistry and Environmental Protection. Official exam: written anonymous Bulgarian ООП or ПП paper, 4 astronomical hours, 0–100 points, pass Среден 3.00 (30/100). 2026 second compulsory sitting 22 May 2026 08:30. Not an official translation or format simulation; no published national fee for current Grade 12 public students.

Sample Bulgaria DZI Chemistry Practice Questions

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

1In атомен строеж, how many protons does a ¹²C nucleus contain?
A.6
B.12
C.8
D.14
Explanation: The atomic number of carbon is 6, so every carbon nucleus has 6 protons. Mass number 12 means 6 protons plus 6 neutrons, not 12 protons. This is core DZI атомен строеж knowledge.
2An Al³⁺ ion is formed from a neutral aluminium atom (Z = 13). How many electrons remain in Al³⁺?
A.13
B.16
C.10
D.3
Explanation: A neutral Al atom has 13 electrons. Forming Al³⁺ removes three electrons, leaving 10. The ion is isoelectronic with neon. Electron count, not proton count, changes when an ion forms.
3What do isotopes of the same element share?
A.The same number of protons
B.The same mass number
C.The same number of neutrons
D.The same nucleon count
Explanation: Isotopes are atoms of one element, so they have the same atomic number (same proton count) but different neutron numbers and therefore different mass numbers. ¹²C and ¹⁴C illustrate this DZI definition.
4The electron configuration of a ground-state Na atom (Z = 11) is:
A.1s² 2s² 2p⁶ 3p¹
B.1s² 2s² 2p⁷
C.1s² 2s² 2p⁶ 3s²
D.1s² 2s² 2p⁶ 3s¹
Explanation: Sodium has 11 electrons. They fill 1s² 2s² 2p⁶ 3s¹, matching group 1 of the Периодична система. The single 3s electron is the valence electron lost to form Na⁺.
5In the Периодична система на химичните елементи (ПСХЕ), the alkali metals occupy which group?
A.Group 1 (IA)
B.Group 2 (IIA)
C.Group 17 (VIIA)
D.Group 18 (VIIIA)
Explanation: Alkali metals (Li, Na, K, Rb, Cs) are group 1 (IA). Each has ns¹ valence configuration and forms M⁺ ions. Group 2 are alkaline earth metals; groups 17 and 18 are halogens and noble gases.
6Which species is a noble gas with a complete valence shell?
A.Cl₂
B.O²⁻
C.Ar
D.Na⁺
Explanation: Argon is a group 18 noble gas with configuration [Ne] 3s² 3p⁶. Cl₂ is a halogen molecule, O²⁻ and Na⁺ are ions that are isoelectronic with neon or argon but are not noble-gas elements.
7How does atomic radius generally change from left to right across period 3?
A.It decreases because nuclear charge increases while the valence shell stays n = 3.
B.It increases because more electron shells are added.
C.It stays constant because all period-3 atoms have the same number of protons.
D.It decreases only for metals and increases for non-metals.
Explanation: Across a period, electrons enter the same valence shell while proton number rises, so attraction pulls the cloud inward and radius falls from Na to Cl. Shell number does not increase until the next period. This is a standard ПСХЕ trend on the DZI УИП.
8The химична връзка in solid NaCl is best described as:
A.Ionic bonding between Na⁺ and Cl⁻
B.A polar covalent bond in discrete NaCl molecules
C.Metallic bonding in a sodium lattice with trapped chlorine
D.Hydrogen bonding between Na and Cl
Explanation: Sodium transfers its 3s electron to chlorine, giving Na⁺ and Cl⁻ held by electrostatic attraction in a crystal lattice. There are no NaCl molecules in the solid, and hydrogen bonding requires H attached to N, O, or F.
9The bond in Cl₂ is:
A.Ionic, because chlorine is a non-metal
B.Metallic, because chlorine conducts in the liquid state
C.A coordinate (dative) bond from one Cl to the other
D.A nonpolar covalent single bond (shared electron pair)
Explanation: Two identical Cl atoms share one electron pair, forming a nonpolar covalent single bond. Ionic bonding requires a metal and a non-metal; metallic bonding is for metals; a dative bond is not required to form Cl₂.
10Which molecule can form водородна връзка (hydrogen bonds) with itself in the liquid state?
A.H₂O
B.CH₄
C.HCl
D.CO₂
Explanation: Hydrogen bonding requires hydrogen attached to a highly electronegative atom (N, O, or F) with a lone pair on a neighbouring molecule. Water has O–H bonds and oxygen lone pairs, so it hydrogen-bonds extensively. CH₄, HCl, and CO₂ do not meet that criterion for intermolecular H-bonding of this type.

About the Bulgaria DZI Chemistry Exam

Държавен зрелостен изпит по химия и опазване на околната среда is Bulgaria's Grade 12 state matriculation exam in Chemistry and Environmental Protection, administered by МОН. The official paper is a written anonymous Bulgarian test lasting 4 astronomical hours, with separate ООП and ПП versions under the Chemistry УИП and ДОС. Scoring uses the MON 0–100 point scale; Среден 3.00 (30/100) is the pass. This free English-language MCQ bank is a study adaptation of core gymnasium chemistry — atomic structure, bonding, periodic trends, solutions, acids and bases, redox, electrochemistry, inorganic groups, organic functional groups and reactions, polymers, and environmental/green chemistry. It is not an official translation and not a format simulation of the live ООП/ПП papers.

Assessment

Official ДЗИ по химия и опазване на околната среда is a written anonymous test. Candidates sit either an ООП (общообразователна подготовка) or ПП (профилирана подготовка) paper, depending on whether Chemistry was studied as a profile subject. Live papers are in Bulgarian and include tasks with selectable answers and free-response items. This 100-question bank is an English MCQ study adaptation of core content (атомен строеж, bonding, solutions, acids/bases, redox, electrochemistry, inorganic groups, organic chemistry, polymers, environmental chemistry). It is not an official translation and does not simulate the live paper format.

Time Limit

Official written duration is 4 astronomical hours (240 minutes). For 2026, the second compulsory DZI sitting is 22 May 2026 at 08:30. Additional-by-choice and August–September sessions follow the current MON timetable.

Passing Score

0–100 points on the MON unified scale (Ordinance No. 11 of 1 September 2016). Pass at Fair / Среден 3.00, equal to 30/100 points. This practice bank is not scored on that scale.

Exam Fee

No published national tariff for current Grade 12 public-school candidates sitting DZI through their school. External or private-candidate arrangements, if any, are school- or ministry-specific and are not a published Chemistry fee. (Ministry of Education and Science of the Republic of Bulgaria (Министерство на образованието и науката, МОН))

Bulgaria DZI Chemistry Exam Content Outline

Study emphasis ~20%

Atomic structure, bonding, periodic table

Атомен строеж, electron configuration, химична връзка, водородна връзка, and ПСХЕ trends.

Study emphasis ~30%

Solutions, acids/bases, redox, electrochemistry

Молна концентрация, масова част, pH, електролитна дисоциация, степен на окисление, cells, електролиза.

Study emphasis ~20%

Inorganic groups and calculations

Group behaviour, stoichiometry, molar mass, gas laws, and thermochemistry.

Study emphasis ~20%

Organic chemistry and polymers

Functional groups, characteristic reactions, and полимеризация.

Study emphasis ~10%

Environmental and green chemistry

Air/water/soil pollution, киселинен дъжд, парников ефект, and зелена химия.

How to Pass the Bulgaria DZI Chemistry Exam

What You Need to Know

  • Passing score: 0–100 points on the MON unified scale (Ordinance No. 11 of 1 September 2016). Pass at Fair / Среден 3.00, equal to 30/100 points. This practice bank is not scored on that scale.
  • Assessment: Official ДЗИ по химия и опазване на околната среда is a written anonymous test. Candidates sit either an ООП (общообразователна подготовка) or ПП (профилирана подготовка) paper, depending on whether Chemistry was studied as a profile subject. Live papers are in Bulgarian and include tasks with selectable answers and free-response items. This 100-question bank is an English MCQ study adaptation of core content (атомен строеж, bonding, solutions, acids/bases, redox, electrochemistry, inorganic groups, organic chemistry, polymers, environmental chemistry). It is not an official translation and does not simulate the live paper format.
  • Time limit: Official written duration is 4 astronomical hours (240 minutes). For 2026, the second compulsory DZI sitting is 22 May 2026 at 08:30. Additional-by-choice and August–September sessions follow the current MON timetable.
  • Exam fee: No published national tariff for current Grade 12 public-school candidates sitting DZI through their school. External or private-candidate arrangements, if any, are school- or ministry-specific and are not a published Chemistry fee.

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Bulgaria DZI Chemistry Study Tips from Top Performers

1Drill молна маса, stoichiometry, pH, молна концентрация, gas-law, and thermochemistry calculations with stated atomic masses — DZI rewards quantitative competence, not recognition alone.
2Keep Bulgarian official terms (степен на окисление, електролитна дисоциация, масова част, зелена химия) attached to the English concept; the live paper is in Bulgarian.
3Know ООП vs ПП: if Chemistry is your profile subject, you sit the ПП paper as the second compulsory DZI (22 May 2026, 08:30).
4Practise balancing окислително-редукционни процеси and assigning oxidation numbers for s-, p-, and d-block species before attempting electrochemistry cells and електролиза.
5After MCQ concept work, practise official Bulgarian constructed-response items from MON sample papers — this bank builds recognition, not live-paper writing under 4 astronomical hours.

Frequently Asked Questions

Is this bank an official translation or format simulation of the DZI Chemistry paper?

No. The official ДЗИ по химия и опазване на околната среда is a Bulgarian written anonymous test with ООП and ПП papers under the Chemistry УИП/ДОС. This is an English-language multiple-choice study adaptation only — not an official translation and not a format simulation.

What is the difference between ООП and ПП Chemistry papers?

ООП (общообразователна подготовка) covers general gymnasium Chemistry. ПП (профилирана подготовка) is for candidates who studied Chemistry as a profile subject (задължителни модули in the second gymnasium stage). The second compulsory DZI for profile Chemistry is the ПП paper; additional-by-choice sittings may be ООП or ПП depending on the pathway.

When is the 2026 DZI Chemistry sitting?

The 2026 second compulsory DZI sitting is 22 May 2026 at 08:30. Additional exams by choice and the August–September session follow the current MON timetable published on mon.bg.

How is DZI Chemistry scored, and what is a pass?

Results are 0–100 points on the MON unified scale under Ordinance No. 11 of 1 September 2016. The exam is passed at Fair / Среден 3.00, which is 30 of 100 points. This practice bank is not scored on that scale.

How long is the official exam, and is there a fee?

The official written paper lasts 4 astronomical hours (240 minutes). There is no published national tariff for current Grade 12 public-school candidates sitting DZI through their school.