BSEK Matric (SSC) Chemistry (Class X Paper II): syllabus, papers and marking
Theory Paper II on the BSEK 20/40/40 pattern: 12 MCQs, any 8 short answers and any 4 descriptive answers, marked against the textbook.
BSEK model question papers for S.S.C. Annual Examinations (20/40/40 pattern) · Annual series · grades A++ to U (IBCC scale)
BSEK Class X Chemistry: where the marks go
BSEK’s Class X Chemistry Paper II is a 60-mark written paper in a 3-hour sitting. Since the 2023 annual examinations the Sindh boards have used a 20/40/40 split, so the paper is 12 MCQs (1 mark each), then any 8 of the short answers at 3 marks (24) and any 4 of the descriptive answers at 6 marks (24). Because the choice is generous, a student can build a strong paper from the chapters they know best.
Questions follow the Sindh textbook closely, and marks are won on precise textbook definitions, labelled diagrams and complete short derivations. Our papers keep the 20/40/40 split and the choice rule, and each lost mark in a marked script is traced to the concept behind it.
Paper structure and what we mark
| Paper | Time | Marks | Weight | Questions |
|---|---|---|---|---|
| Section A — Multiple Choice | 3 h (whole paper) | 12 | 20% | 12 MCQs from the whole syllabus, 1 mark each |
| Section B — Short Answers | — | 24 | 40% | Answer any 8 questions, 3 marks each |
| Section C — Descriptive Answers | — | 24 | 40% | Answer any 4 questions, 6 marks each |
Syllabus outline
- Topics of the Sindh Textbook Board Class X Chemistry course (chapter order not confirmed from the board document): chemical equilibrium; acids, bases and salts; organic chemistry and hydrocarbons; biochemistry; the atmosphere and water; chemical industries
How each paper is marked here
- The twelve MCQs are scored automatically against the key.
- Three-mark short answers are marked on the key point and its reason; six-mark descriptive answers on each stated step or labelled part.
- Every lost mark is tagged to the concept behind it, and recurring slips are tracked across papers.
Where BSEK Class X Chemistry candidates lose marks
- Equation not balanced, or state symbols missing — A correct reaction with the wrong coefficients loses the mark; balance first, then add (s), (l), (g) or (aq) where the question asks for them.
- Mole calculation with the wrong molar mass — Stoichiometry answers fail at the first step when the molar mass is added up wrongly; the rest of the working then cannot earn its marks.
- Definition that names the example, not the idea — Terms such as electronegativity, ionisation energy, equilibrium constant or isotope need the property itself; an example alone is not enough.
- Organic reactions with the wrong conditions — Naming the product but leaving out the reagent, catalyst or temperature (for example for dehydration or hydrogenation) is a standard half-mark loss.
- Trends stated without the reason — Periodic-table questions ask for the trend and the reason (shielding, nuclear charge, size); the trend alone earns half.
Sample papers, mark schemes and marked reports for BSEK Class X Chemistry
See a real handwritten script marked by eight examiners at admitportfolio.com/examiners.
Questions teachers ask
- Do the other Sindh boards use the same paper?
- Hyderabad, Sukkur, Larkana, Mirpurkhas and Shaheed Benazirabad use the same Sindh textbooks, and press reports say the Sindh boards agreed the 20/40/40 split together in 2023. We have not been able to open those boards’ own model papers, so we list this page under BSEK only.
- Is the practical marked?
- No. We generate and mark the theory paper.
- Is this official BSEK marking?
- No. Board of Secondary Education Karachi marks the real exam. This is examiner-style marking of mocks and homework for BSEK Class X Chemistry. Only you see the marking, and you decide what reaches the student.
- Do you reproduce past-paper questions?
- No. Every Class X Paper II paper here is original and written to the bsek model question papers for s.s.c. annual examinations (20/40/40 pattern), in the same structure as the real papers shown above.
- Which papers are marked?
- None yet are marked question by question; Section A are scored instantly. Practical exams sat at the centre are not marked here.
- How is the next paper chosen?
- From the marks a student lost: the concepts behind them are ranked by marks dropped, and the new paper weights those topics. It is the same syllabus and structure, with new questions.
- When are the exams?
- Annual series. Grades A++ to U (IBCC scale).