Practise 15 real Federal Board questions on s-Block/Group IV-A elements from 2023 to 2026. See the answer and explanation as soon as you answer.
s-Block/Group IV-A elements is one of the 19 main chapters in our Federal Board FSC Chemistry question bank (11th class), and about 3% of its real questions come from it. Tayyari Karo has 15 real questions on this chapter from 2023 to 2026; 7 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 10 medium, 4 easy, 1 hard.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
Which of the following is possible?
Answer: C. F₂+2KBr→2KF+Br₂
A more reactive (higher up the group) halogen displaces a less reactive one from its salt; F₂ (most reactive) displaces Br⁻ from KBr, giving F₂+2KBr→2KF+Br₂.
An element M reacts with O₂, H₂O and Cl₂ to form the products M₂O, MOH and MCl respectively. The element is most likely:
Answer: A. Li
The +1 pattern (M₂O, MOH, MCl) is characteristic of an alkali metal like Li; Mg/Ca are divalent and Al is trivalent.
Which compound of sulfur is used as fertilizer?
Answer: A. (NH₄)₂SO₄
Ammonium sulfate, (NH₄)₂SO₄, is a widely used nitrogen-supplying fertilizer.
Which of the following halides can reduce H₂SO₄ to H₂S?
Answer: D. NaI
I⁻ is the strongest reducing agent among the halides and can reduce concentrated H₂SO₄ all the way down to H₂S.
Which of the following halogens exists in solid state at room temperature?
Answer: A. I₂
Iodine (I₂) is a solid at room temperature; F₂ and Cl₂ are gases, Br₂ is a liquid.
By passing H₂S gas through water to make a saturated solution exposed to air produces:
Answer: C. Rhombic Sulphur
2H₂S + O₂ → 2S + 2H₂O; the sulphur slowly deposited from this oxidation in air is ordinary Rhombic (α) sulphur.
Write three equations showing reaction of chlorides with water.
1. PCl₃ + 3H₂O → H₃PO₃ + 3HCl
2. SiCl₄ + 2H₂O → SiO₂ + 4HCl
3. AlCl₃ + 3H₂O → Al(OH)₃ + 3HCl
Describe the use of compounds of sulphur in any three chemical industries.
1. Sulfuric acid (H₂SO₄), made from sulphur via SO₂/SO₃, is used in fertilizer manufacture (superphosphate, ammonium sulfate), in the petroleum refining industry, and in lead-acid batteries.
2. Sodium thiosulfate is used in the photographic industry as a fixer, and in the textile/dyeing industry as a bleaching/reducing agent.
3. Sulfur dioxide (SO₂) is used in the paper and pulp industry as a bleaching agent, and as a preservative/fumigant in the food industry.
| Session | Questions |
|---|---|
| 2026 Annual | 4 |
| 2025 1st Annual | 5 |
| 2025 2nd Annual | 3 |
| 2023 Annual | 3 |
15 real Federal Board (FBISE) Chemistry questions on s-Block/Group IV-A elements from 2023 to 2026, for 11th class. 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.
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