BBISE Intermediate (HSSC) Chemistry (Class XI): syllabus, papers and marking
A 90-mark paper: 80 theory marks (17 MCQs, 13 three-mark and four six-mark questions) plus 10 practical-based marks.
BBISE HSSC-I model papers, published 11 October 2026 · Annual and Second Annual series · grades A++ to U (IBCC scale)
BBISE Inter Chemistry: where the marks go
BBISE’s HSSC-I Chemistry model paper (October 2026) is 80 theory marks plus a 10-mark practical-based assessment, 90 in all: 17 MCQs, any 13 of the short questions at 3 marks (39), and four six-mark questions, each with two alternatives of which one is answered (24), in a 3-hour paper.
The model questions cover mole and limiting-reactant calculations, electronic configurations, molecular-orbital diagrams, pH and molality, rate laws, solubility product and the preparation of alcohols. Marks go on balanced equations and complete working.
Paper structure and what we mark
| Paper | Time | Marks | Weight | Questions |
|---|---|---|---|---|
| Class XI · Section 1 — Multiple Choice (Class XI) | 3 h (whole paper) | 17 | 18.9% | 17 MCQs, 1 mark each: write the question number and the correct option on the answer script |
| Class XI · Section 2 — Short Answers (Class XI) | — | 39 | 43.3% | Any 13 questions, 3 marks each |
| Class XI · Section 3 — Detailed Answers (Class XI) | — | 24 | 26.7% | Four questions of 6 marks, each with two alternatives (answer one) |
| Class XI · Section 4 — Practical Based Assessment (Class XI) | — | 10 | 11.1% | Any 2 of 3 PBA questions, 2 × 4 marks, plus 2 marks (8 + 2) |
Syllabus outline
- Topics tested in the October 2026 model paper (the board has not posted a unit list):
- Stoichiometry and limiting reactants
- Atomic structure and electronic configuration
- Chemical bonding and molecular orbitals
- Liquids and solids: surface tension, unit cells
- Solutions and pH
- Chemical kinetics
- Ionic equilibria and solubility product
- Alcohols and other organic chemistry
How each paper is marked here
- The seventeen MCQs are scored automatically against the key.
- Short answers are marked on the key point; six-mark answers on each stated step.
- The practical-based assessment is separate and not part of our theory marking.
Where BBISE Inter 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 BBISE Inter Chemistry
See a real handwritten script marked by eight examiners at admitportfolio.com/examiners.
Questions teachers ask
- Why is there only Class XI?
- BBISE’s October 2026 model papers are published for HSSC-I (Class XI) only; a Class XII layout has not been verified.
- What is the 8 + 2 practical mark?
- Section 4 is a practical-based assessment: two of three questions (8 marks) plus 2 marks, so the paper is 90 marks with 80 theory.
- Is this official BBISE marking?
- No. Balochistan Board of Intermediate and Secondary Education, Quetta marks the real exam. This is examiner-style marking of mocks and homework for BBISE Inter Chemistry. Only you see the marking, and you decide what reaches the student.
- Do you reproduce past-paper questions?
- No. Every Class XI paper here is original and written to the bbise hssc-i model papers, published 11 october 2026, in the same structure as the real papers shown above.
- Which papers are marked?
- None yet are marked question by question; Class XI · Section 1 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 and Second Annual series. Grades A++ to U (IBCC scale).