Practise 17 real Federal Board questions on Chemical Equilibrium from 2023 to 2025. See the answer and explanation as soon as you answer.
Chemical Equilibrium is one of the 11 main chapters in our Federal Board Matric Chemistry question bank (10th class), and about 5% of its real questions come from it. Tayyari Karo has 17 real questions on this chapter from 2023 to 2025; 6 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 12 medium, 5 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.
The correct equilibrium constant expression for the given reaction is: 2A + B ⇌ 3C
Answer: D. [C]³ / [A]²[B]
Kc is written as products over reactants, each raised to its stoichiometric coefficient: Kc = [C]³ / ([A]²[B]).
Concentration of reactants and products in moles dm⁻³ in a dilute solution represents:
Answer: D. Active mass
The 'active mass' of a substance in a reaction is its molar concentration (moles per dm³), the quantity used in equilibrium constant expressions.
Which condition favors the forward direction of an exothermic reaction?
Answer: B. Low temperature
By Le Chatelier's principle, lowering the temperature favors the exothermic (heat-releasing) direction of a reversible reaction.
In given expression what is the product? Kc = [R][S] / [P][Q][T]
Answer: C. R S
In the equilibrium constant expression, the numerator terms [R][S] represent the products of the reaction.
The chemical method used to recognize chemical equilibrium state is called:
Answer: D. Titration
Titration can be used to measure concentrations of reactants/products at equilibrium, confirming that the reaction has reached a constant (equilibrium) state.
Predict the unit of equilibrium constant (Kc) for the following reaction: 2ICl(g) ⇌ I₂(g) + Cl₂(g)
Answer: B. No units
Kc = [I₂][Cl₂]/[ICl]², units = (mol/dm³)²/(mol/dm³)² — the units cancel out completely, giving no units.
State necessary conditions for chemical equilibrium.
1. The system must be a closed system (no exchange of matter with surroundings).
2. The rate of forward reaction must equal the rate of backward reaction.
3. Macroscopic properties (concentration, colour, pressure) of the system must remain constant over time, at constant temperature.
Enlist any three necessary conditions for chemical equilibrium.
1. The system must be a closed system (no matter enters/leaves).
2. Rate of forward reaction = rate of backward reaction.
3. Concentrations of reactants and products remain constant over time at a given constant temperature.
| Session | Questions |
|---|---|
| 2025 1st Annual | 5 |
| 2025 2nd Annual | 5 |
| 2024 Annual | 3 |
| 2023 Annual | 4 |
17 real Federal Board (FBISE) Chemistry questions on Chemical Equilibrium 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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