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Class 9 Chemistry · Chapter 6 · Test 1

Dynamic Equilibrium

25 MCQs covering reversible and irreversible reactions, equilibrium, dynamic equilibrium, closed systems, equilibrium rates, and basic examples of reversible reactions.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What symbol is used to represent a reversible reaction?

    • A→
    • B⇌
    • C=
    • D↑
    Show answer

    Answer: B

    A reversible reaction is represented by two half arrowheads pointing in opposite directions.

  2. Question 2

    What is a reversible reaction?

    • AA reaction that occurs only in the forward direction
    • BA reaction that can occur in both forward and backward directions
    • CA reaction that cannot form products
    • DA reaction that occurs only at high temperature
    Show answer

    Answer: B

    In a reversible reaction the reactants form products and the products can react to form the reactants again.

  3. Question 3

    What is an irreversible reaction?

    • AA reaction that proceeds only in the forward direction
    • BA reaction that always reaches equilibrium
    • CA reaction that occurs in both directions
    • DA reaction that produces no products
    Show answer

    Answer: A

    An irreversible reaction moves in the forward direction only and generally goes to completion.

  4. Question 4

    Why does a reversible reaction not normally go to completion?

    • AThe products can react to form the reactants again
    • BThe reactants disappear instantly
    • CThe reaction has no products
    • DThe temperature becomes zero
    Show answer

    Answer: A

    In a reversible reaction the products react among themselves to regenerate the reactants.

  5. Question 5

    At dynamic equilibrium the rate of the forward reaction is:

    • AGreater than the reverse reaction
    • BLess than the reverse reaction
    • CEqual to the reverse reaction
    • DZero
    Show answer

    Answer: C

    At dynamic equilibrium the rates of the forward and backward reactions are equal.

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