Practise 26 real Federal Board questions on Chemical Industries from 2023 to 2025. See the answer and explanation as soon as you answer.
Chemical Industries is one of the 11 main chapters in our Federal Board Matric Chemistry question bank (10th class), and about 7% of its real questions come from it. Tayyari Karo has 26 real questions on this chapter from 2023 to 2025; 7 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 17 medium, 9 easy.
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.
Separation of Minerals from gangue by some physical method is called:
Answer: B. Concentration
Concentration (ore dressing) is the physical process of separating valuable mineral particles from the unwanted gangue material.
In Solvay process, which two chemicals are dissolved in water to form ammonical brine?
Answer: C. NH₃ + NaCl
Ammonical brine is prepared by dissolving ammonia gas (NH₃) into saturated brine (NaCl solution).
Which process is used in the industrial manufacturing of sodium carbonate?
Answer: C. Solvay Process
The Solvay process is the industrial method used to manufacture sodium carbonate (Na₂CO₃) from brine, ammonia and limestone.
Percentage of Nitrogen in urea is:
Answer: D. 46.6
Urea, CO(NH₂)₂, has molar mass 60 g/mol with 28 g of nitrogen, giving %N = 28/60 × 100 ≈ 46.6%.
Oil detergent is used to concentrate a metallic ore in:
Answer: A. Flotation process
In the froth flotation process, oil/detergent (frothing agent) helps ore particles stick to air bubbles and float, separating them from gangue.
Dark brownish viscous liquid (Petroleum) is formed underground due to:
Answer: C. Heat, pressure, bacterial effects and absence of air
Petroleum forms from the decay of ancient marine organisms under heat, pressure and bacterial action in the absence of air (anaerobic conditions) over millions of years.
What are advantages of urea as a fertilizer? (Any three)
1. Urea has a very high nitrogen content (46%), so a smaller quantity supplies more nitrogen to crops than other fertilizers.
2. It is highly soluble in water, allowing easy and uniform application/absorption by plants.
3. It is easy to store, transport and handle since it is a stable solid, and is relatively inexpensive to manufacture.
Explain briefly petroleum and its formation.
Petroleum (crude oil) is a naturally occurring dark, viscous liquid mixture of hydrocarbons (along with small amounts of sulfur, nitrogen and oxygen compounds), found trapped in rock formations deep underground/undersea.
Formation: Petroleum is formed over millions of years from the remains of dead microscopic marine organisms (plankton, algae) that settled at the bottom of ancient seas and were buried under layers of sediment. …
The full model answer is in the app.
| Session | Questions |
|---|---|
| 2025 1st Annual | 7 |
| 2025 2nd Annual | 7 |
| 2024 Annual | 7 |
| 2023 Annual | 5 |
26 real Federal Board (FBISE) Chemistry questions on Chemical Industries from 2023 to 2025, for 10th 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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