What is the defining condition of dynamic equilibrium?

Forward and backward reaction rates are equal

In a closed system why does a reversible reaction usually not go completely to products?

Products can react in the reverse direction

The catalyst stops the reaction

What happens when a product is removed from a reversible equilibrium?

Equilibrium shifts toward the products

Equilibrium shifts toward the reactants

Class 9 Chemistry · Chapter 6 · Test 10

Equilibria Full Test

25 MCQs covering reversible reactions, dynamic equilibrium, concentration, temperature, pressure, catalysts, hydrated compounds, driving reactions to completion, and industrial applications of equilibrium.

MCQs

24 questions · 20 min · 24 marks

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Sample questions

The first 5 of 24. Try each one, then tap to see the answer.

Question 1
Which symbol represents a reversible reaction?
- A→
- B⇌
- C=
- D↑
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Answer: B
The symbol ⇌ indicates that a reaction can proceed in both forward and backward directions.
Question 2
What is the defining condition of dynamic equilibrium?
- AThe reaction stops
- BReactants disappear
- CForward and backward reaction rates are equal
- DOnly products remain
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Answer: C
At dynamic equilibrium both reactions continue but their rates are equal.
Question 3
In a closed system why does a reversible reaction usually not go completely to products?
- AProducts can react in the reverse direction
- BReactants cannot collide
- CProducts always escape
- DThe catalyst stops the reaction
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Answer: A
Products remain in the closed system and can participate in the reverse reaction.
Question 4
What happens to the concentrations of reactants and products at equilibrium?
- AThey continuously increase
- BThey continuously decrease
- CThey remain constant
- DThey become zero
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Answer: C
At equilibrium concentrations remain constant although the reactions continue.
Question 5
What happens when a product is removed from a reversible equilibrium?
- AEquilibrium shifts toward the products
- BEquilibrium shifts toward the reactants
- CThe reaction stops
- DNo reaction occurs
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Answer: A
Removing a product causes the system to form more product to restore equilibrium.

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