Practise 499 real Federal Board Chemistry questions from 2023 to 2026. See an answer and explanation as soon as you answer.
FSC Chemistry is examined by the Federal Board of Intermediate and Secondary Education (FBISE) in the annual examinations, for 11th and 12th class. Tayyari Karo has real questions from 2023 to 2026, covering topics such as Basic Concepts, Fundamental Principles of Organic Chemistry, s and p Block elements, Chemical Equilibrium and Chemical Bonding. Working through real papers is the fastest way to learn the paper pattern and the way questions are worded.
170 of the questions are multiple choice and marked instantly; the rest are short and long questions with a model answer. The answers are prepared by Tayyari Karo, since we could not find an official marking scheme.
These are real past-paper questions. Think of your answer first, then open the explanation.
When two atoms bond with each other through overlapping of their sp³ hybrid orbitals, predict which bond is formed?
Answer: D. Sigma (σ) covalent bond
Head-on (axial) overlap of hybrid orbitals such as sp³ always gives a sigma (σ) bond; sideways overlap of unhybridized p orbitals gives π bonds.
The wave number (ṽ) of a radiation having λ = 2×10⁸ nm will be:
Answer: C. 0.5×10⁸ nm⁻¹
Wave number ṽ = 1/λ. Using the numbers as given, ṽ = 1/2 × 10⁸ = 0.5×10⁸ nm⁻¹.
How much mass of O₂ is required to react with 27 g of Aluminum (Al) to produce Al₂O₃? (4Al + 3O₂ → 2Al₂O₃)
Answer: A. 24 g of oxygen
Moles of Al = 27/27 = 1 mol. From the equation, mol O₂ = (3/4)×1 = 0.75 mol ⇒ mass = 0.75×32 = 24 g.
Unit cell is primarily concerned with the shape of crystal. Calculate number of Cl⁻ ions and Na⁺ ions in unit cell of NaCl.
In the NaCl (face-centred cubic) unit cell:
Cl⁻ ions: 8 at corners (1/8 each) + 6 at face centres (1/2 each) = 8×1/8 + 6×1/2 = 1 + 3 = 4 Cl⁻ ions.
Na⁺ ions: 12 at edge centres (1/4 each) + 1 at body centre = 12×1/4 + 1 = 3 + 1 = 4 Na⁺ ions.
So each unit cell contains 4 NaCl formula units.
Number of questions available for each exam session.
| Session | 11th class | 12th class |
|---|---|---|
| 2026 Annual | 51 | 53 |
| 2025 1st Annual | 53 | 53 |
| 2025 2nd Annual | 53 | 53 |
| 2024 Annual | 51 | 52 |
| 2023 Annual | 40 | 40 |
Yes. Every question comes from a Federal Board (FBISE) Chemistry paper from 2023 to 2026, and each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
You can start free with no signup. A small set of papers per subject is free, and Premium unlocks the full question bank.
11th and 12th class. The table below shows how many questions we have for each exam session.
