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Exam Review

Key Facts: OGE Chemistry Exam

2026 official task count: 23; primary-score maximum: 38.

Duration: 180 minutes.

Official format: 19 short-answer tasks and four developed responses, including a real laboratory experiment in task 23.

Assessment language: Russian.

2026 federal recommendation: grade 3 begins at 10 of 38 primary points; regional authorities approve the final conversion scale.

This is independent practice and an English-language MCQ study adaptation, not an official translation, an official paper or a simulation of the exam language environment. Choices about experimental methods cannot replace supervised work with real laboratory equipment.

23 tasks; 180 minutes; maximum 38 primary points. This is independent practice and an English-language MCQ study adaptation, not an official translation, an official paper or a simulation of the exam language environment. Choices about experimental methods cannot replace supervised work with real laboratory equipment.

Sample OGE Chemistry Practice Questions

Try these sample questions to review concepts for the OGE Chemistry exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1How many protons, neutrons, and electrons are contained in a neutral atom of phosphorus-31 (³¹P, atomic number 15)?
A.15 protons, 16 neutrons, 15 electrons
B.15 protons, 31 neutrons, 15 electrons
C.16 protons, 15 neutrons, 16 electrons
D.31 protons, 16 neutrons, 15 electrons
Explanation: The atomic number 15 indicates 15 protons in the nucleus and 15 electrons in the neutral atom. The number of neutrons equals the mass number minus the atomic number: 31 − 15 = 16 neutrons.
2How many valence electrons are present in the outer shell of Group 16 elements such as oxygen and sulfur in their ground state?
A.2 valence electrons
B.4 valence electrons
C.6 valence electrons
D.8 valence electrons
Explanation: Elements in Group 16 (Group VIA) have an outer electron shell configuration of ns²np⁴. Adding the two s-electrons and four p-electrons gives a total of 6 valence electrons.
3What is the electron configuration of the aluminium cation Al³⁺ (atomic number 13)?
A.1s²2s²2p⁶3s²3p¹
B.1s²2s²2p⁶
C.1s²2s²2p⁶3s²
D.1s²2s²2p⁶3p³
Explanation: A neutral aluminium atom has 13 electrons with the configuration 1s²2s²2p⁶3s²3p¹. Forming the Al³⁺ cation involves losing all 3 valence electrons from the third shell, leaving the stable neon configuration 1s²2s²2p⁶.
4How does the atomic radius change across Period 3 of the periodic table from sodium (Na) to chlorine (Cl)?
A.Increases continuously
B.Remains strictly constant
C.Increases then sharply drops at silicon
D.Decreases gradually
Explanation: Across a period from left to right, electrons are added to the same outermost energy shell while nuclear charge increases. The higher effective nuclear charge exerts a stronger electrostatic pull on the electron cloud, causing the atomic radius to decrease.
5How do nonmetallic properties change down Group 17 (halogens) from fluorine to iodine?
A.They increase because atomic mass increases
B.They decrease because atomic radius increases and attraction for electrons weakens
C.They remain unchanged because all halogens have seven valence electrons
D.They increase then decrease at bromine
Explanation: Down Group 17, additional electron shells increase the atomic radius and shielding effect. As a result, the nucleus attracts incoming valence electrons less strongly, decreasing electronegativity, oxidizing ability, and nonmetallic character.
6Which of the following correctly describes the trend in metallic properties among Period 2 elements: lithium (Li), beryllium (Be), and boron (B)?
A.Metallic properties weaken from lithium to boron
B.Metallic properties strengthen from lithium to boron
C.Beryllium exhibits stronger metallic properties than lithium
D.Boron exhibits the strongest metallic properties in Period 2
Explanation: Moving from left to right across Period 2, nuclear charge increases and atomic radius decreases, holding outer electrons more tightly. Consequently, the tendency to donate electrons weakens, meaning metallic properties decrease from lithium (alkali metal) to beryllium (alkaline earth metal) to boron (metalloid).
7What is the highest oxidation state exhibited by phosphorus in its chemical compounds?
A.+3
B.+4
C.+5
D.+6
Explanation: Phosphorus belongs to Group 15 (Group VA) and has 5 valence electrons (3s²3p³). Its highest positive oxidation state corresponds to its group number, which is +5, as seen in phosphorus pentoxide (P2O5) and phosphoric acid (H3PO4).
8How many electron energy levels (shells) are occupied by electrons in a ground-state calcium atom (Ca, atomic number 20)?
A.2 shells
B.3 shells
C.5 shells
D.4 shells
Explanation: Calcium is located in Period 4 of the periodic table. The period number equals the total number of occupied electron shells, so calcium has 4 occupied shells with the electron distribution 2, 8, 8, 2.
9For this exercise use electronegativities H = 2.2, C = 2.6, and F = 4.0. Which bond has the greatest electronegativity difference?
A.F–F
B.C–H
C.C–C
D.H–F
Explanation: Compare the absolute difference for each bond, rather than the electronegativity of one atom alone. H–F has a difference of 4.0 − 2.2 = 1.8, larger than 0.4 for C–H and zero for either identical-atom bond.
10What is the nuclear composition of the chlorine-37 isotope (³⁷Cl, atomic number 17)?
A.17 protons, 17 neutrons, 20 electrons
B.17 protons and 20 neutrons
C.20 protons and 17 neutrons
D.37 protons and 17 neutrons
Explanation: The atomic number 17 defines the number of protons in the nucleus. The neutron count equals the mass number minus the atomic number: 37 − 17 = 20 neutrons.

About the OGE Chemistry Exam

Main State Exam (ОГЭ) in Chemistry is a current 2026 subject assessment within Russian state final certification. 19 short-answer tasks and four developed responses, including a real laboratory experiment in task 23. The maximum primary score is 38. Assessment language: Russian. This is independent practice and an English-language MCQ study adaptation, not an official translation, an official paper or a simulation of the exam language environment. Choices about experimental methods cannot replace supervised work with real laboratory equipment. This bank contains 100 reviewed study questions. It is a selective learning resource, not complete coverage of every official topic or a replica of an examination paper.

Exam sponsor: Rosobrnadzor / FIPI. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

23 questions

Time Limit

180 minutes

Passing Score

2026 federal recommendation: grade 3 begins at 10 of 38 primary points; regional authorities approve the final conversion scale.

Exam / Certification Fees

A current official fee statement was not confirmed in the sources checked; ask the regional examination authority.

Exam sponsor website

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

Official sources

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.

4/38 (10.5%)

Initial chemical concepts

Three tasks on initial chemical concepts. Figures describe the official 2026 paper, not the number of study MCQs.

4/38 (10.5%)

Periodicity and atomic structure

Three tasks on the periodic law, table and atoms. Figures describe the official 2026 paper, not the number of study MCQs.

1/38 (2.6%)

Structure of substances

One task on substance structure. Figures describe the official 2026 paper, not the number of study MCQs.

13/38 (34.2%)

Inorganic substances

Six tasks on inorganic substances, nonmetals, metals and their compounds. Figures describe the official 2026 paper, not the number of study MCQs.

9/38 (23.7%)

Chemical reactions

Six tasks on chemical reactions. Figures describe the official 2026 paper, not the number of study MCQs.

3/38 (7.9%)

Chemistry and the environment

Two tasks on chemistry and the environment. Figures describe the official 2026 paper, not the number of study MCQs.

4/38 (10.5%)

Calculations

Two calculation tasks. The bank groups experimental study with calculations, but the official task categories differ. Figures describe the official 2026 paper, not the number of study MCQs.

Preparing for the OGE Chemistry Exam

What You Need to Know

  • Passing score: 2026 federal recommendation: grade 3 begins at 10 of 38 primary points; regional authorities approve the final conversion scale.
  • Exam length: 23 questions
  • Time limit: 180 minutes
  • Exam / certification fees: A current official fee statement was not confirmed in the sources checked; ask the regional examination authority. Official sources

Using Our Practice Resources

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

OGE Chemistry: Suggested Study Strategy

1Use the approved 2026 FIPI specification and codifier to check the full assessed scope.
2Review the worked feedback here, then explain your reasoning without looking at the choices.
3Practise the official response methods separately, including complete written, spoken, laboratory, or computer work where required.

Frequently Asked Questions

What is the official 2026 assessment format?

19 short-answer tasks and four developed responses, including a real laboratory experiment in task 23. Assessment language: Russian.

How is the result assessed?

2026 federal recommendation: grade 3 begins at 10 of 38 primary points; regional authorities approve the final conversion scale.

Does this bank reproduce the official assessment?

This is independent practice and an English-language MCQ study adaptation, not an official translation, an official paper or a simulation of the exam language environment. Choices about experimental methods cannot replace supervised work with real laboratory equipment.

Who can take the assessment?

The OGE is part of grade 9 state final certification. Confirm admission requirements, the final oral-interview result and any permitted accommodations with the school or regional authority.

What is the examination fee?

A current official fee statement was not confirmed in the sources checked; ask the regional examination authority.

How much of the exam does this bank cover?

This bank contains 100 reviewed study questions. It is a selective learning resource, not complete coverage of every official topic or a replica of an examination paper. Use the official codifier and complete original-response practice to address the full assessment.