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NEET Chemistry: Concepts of dynamic equilibrium Practice Questions

15 free multiple-choice questions on Concepts of dynamic equilibrium (Equilibrium) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

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  1. Q1. If the system is at equilibrium, what does this imply about the net change in the amount of substance over time?

    • AThe amount of substance is continuously decreasing
    • BThe amount of substance depends on the initial conditions
    • CThere is no net change in the amount of substance
    • DThe amount of substance is continuously increasing
    Show answer & explanation

    Correct answer: C — There is no net change in the amount of substance

    Equilibrium, whether static or dynamic, implies that the macroscopic properties, such as the total amount of substance, are constant over time.

  2. Q2. In a system that is at dynamic equilibrium, which of the following statements is true regarding the reaction rates?

    • AThe net rate of reaction is zero and no reactions are occurring
    • BThe rate of the forward reaction is equal to the rate of the reverse reaction
    • CThe rate of the forward reaction is zero
    • DThe rate of the reverse reaction is zero
    Show answer & explanation

    Correct answer: B — The rate of the forward reaction is equal to the rate of the reverse reaction

    Dynamic equilibrium is a state where the rates of the forward and reverse reactions are equal, meaning the concentrations of reactants and products remain constant, but the reactions themselves are still occurring at equal rates.

  3. Q3. In a system undergoing a reversible chemical reaction, what is the defining characteristic of dynamic equilibrium?

    • AThe reaction proceeds irreversibly
    • BThe concentrations of reactants and products are constant
    • CThe reaction stops completely
    • DThe forward and reverse reaction rates are equal
    Show answer & explanation

    Correct answer: D — The forward and reverse reaction rates are equal

    Dynamic equilibrium is a state where the forward and reverse reaction rates are equal, meaning the net concentrations of reactants and products remain constant, even though the reactions are still occurring simultaneously.

  4. Q4. Which of the following best describes the state of concentrations of reactants and products when a system is at dynamic equilibrium?

    • AThe concentrations of all species remain constant
    • BProducts are consumed faster than reactants are formed
    • CThe reaction has stopped entirely
    • DReactants are consumed faster than products are formed
    Show answer & explanation

    Correct answer: A — The concentrations of all species remain constant

    In dynamic equilibrium, although reactions are still occurring, the net change in concentrations of reactants and products is zero, meaning their concentrations are constant over time.

  5. Q5. If a reaction is at equilibrium, it implies that the system is reversible. What does reversibility mean in this context?

    • AThe reaction is irreversible
    • BThe reaction cannot proceed in either direction
    • CThe reaction is spontaneous
    • DThe forward and reverse reactions are occurring simultaneously
    Show answer & explanation

    Correct answer: D — The forward and reverse reactions are occurring simultaneously

    Reversibility means that both the forward and reverse reactions are simultaneously taking place, establishing the balance necessary for equilibrium.

  6. Q6. For a reversible reaction to be in dynamic equilibrium, which condition must be met?

    • AThe rates of the forward and reverse reactions must be equal
    • BThe reaction must occur in a closed system
    • CThe reaction must be endothermic
    • DThe concentration of reactants must be zero
    Show answer & explanation

    Correct answer: A — The rates of the forward and reverse reactions must be equal

    Dynamic equilibrium is achieved when the rates of the forward and reverse reactions are equal, ensuring that the concentrations of reactants and products remain constant.

  7. Q7. Which statement accurately describes a system undergoing dynamic equilibrium?

    • AThe forward reaction is dominant over the reverse reaction.
    • BThe system is constantly adjusting to maintain balanced reaction rates.
    • CThe system is static and non-reactive.
    • DThe system has reached a state of no change.
    Show answer & explanation

    Correct answer: B — The system is constantly adjusting to maintain balanced reaction rates.

    Dynamic equilibrium is characterized by the continuous balancing of opposing reaction rates, meaning the system is constantly adjusting to maintain equilibrium.

  8. Q8. The term 'dynamic' in dynamic equilibrium refers to the fact that:

    • AThe reaction has stopped completely
    • BThe system is at static condition
    • CThe equilibrium constant is time-dependent
    • DThe reactions are continuously occurring in both directions
    Show answer & explanation

    Correct answer: D — The reactions are continuously occurring in both directions

    The term 'dynamic' signifies that the forward and reverse reactions are continuously taking place, constantly interconverting reactants into products, leading to the equilibrium state.

  9. Q9. For a reversible reaction in dynamic equilibrium, which of the following statements is true regarding the reaction rates?

    • ARate of the forward reaction is less than the rate of the reverse reaction
    • BRate of the forward reaction is greater than the rate of the reverse reaction
    • CThe reaction stops completely
    • DThe rates of the forward and reverse reactions are equal
    Show answer & explanation

    Correct answer: D — The rates of the forward and reverse reactions are equal

    In dynamic equilibrium, the system is at equilibrium when the rate of the forward reaction (R_f) exactly equals the rate of the reverse reaction (Rᵣ), i.e., R_f = Rᵣ.

  10. Q10. What is the essential requirement for a chemical system to be maintained in a state of dynamic equilibrium?

    • AThe rates of the forward and reverse processes must be equal
    • BThe initial concentrations must be equal
    • CThe system must be isolated from all external influences
    • DThe reaction must be irreversible
    Show answer & explanation

    Correct answer: A — The rates of the forward and reverse processes must be equal

    Dynamic equilibrium is achieved when the rates of the forward and reverse reactions balance each other out, leading to no net change in concentrations.

  11. Q11. In a system at dynamic equilibrium, what is the relationship between the forward and reverse reaction rates?

    • ARate of forward reaction is zero
    • BRate of forward reaction is always greater than the rate of the reverse reaction
    • CRate of forward reaction is equal to the rate of the reverse reaction
    • DThe rates are inversely proportional
    Show answer & explanation

    Correct answer: C — Rate of forward reaction is equal to the rate of the reverse reaction

    For a system to be in dynamic equilibrium, the rates of the forward reaction (product formation) and the reverse reaction (reactant formation) must be exactly equal.

  12. Q12. Consider a reversible reaction A ⇌ B. If the system is established at equilibrium, what does this imply about the molecular activity of reactants and products?

    • AThe reaction stops immediately
    • BReactants are completely consumed and products are completely formed
    • CThe equilibrium constant is zero
    • DThe concentrations of reactants and products are constant
    Show answer & explanation

    Correct answer: D — The concentrations of reactants and products are constant

    In dynamic equilibrium, while the reaction proceeds, the concentrations of reactants and products remain fixed and constant.

  13. Q13. A chemical reaction reaching equilibrium is classified as dynamic because:

    • AReactions are still occurring in both directions
    • BThe equilibrium constant becomes zero
    • CThe reaction stops completely
    • DThe system is static
    Show answer & explanation

    Correct answer: A — Reactions are still occurring in both directions

    Dynamic equilibrium signifies that the reactions are continuous, and the forward and reverse reactions are still happening simultaneously, just at equal rates.

  14. Q14. What is the key characteristic that distinguishes a system at dynamic equilibrium from a system at static equilibrium?

    • ADynamic equilibrium is reversible, while static equilibrium is irreversible
    • BStatic equilibrium involves no energy change
    • CDynamic equilibrium involves continuous movement of reactants and products
    • DDynamic equilibrium only occurs in closed systems
    Show answer & explanation

    Correct answer: C — Dynamic equilibrium involves continuous movement of reactants and products

    Dynamic equilibrium implies continuous, reversible reactions occurring at equal rates, whereas static equilibrium implies a state where no net change occurs (often associated with static systems).

  15. Q15. If a closed container of gas is at dynamic equilibrium, what does this imply about the macroscopic properties of the system?

    • AThe volume is changing
    • BThe temperature is constant
    • CThe total pressure is constant
    • DThe reaction stops completely
    Show answer & explanation

    Correct answer: C — The total pressure is constant

    Dynamic equilibrium implies that the system remains stable. For a closed system at equilibrium, the macroscopic properties like pressure and temperature remain constant.

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