Q1. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life (t1/2)? (2022)
Solution:
The half-life of a first-order reaction is given by the expression t1/2 = 0.693/k, where k is the rate constant.
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Q2. What is the effect of a catalyst on a chemical reaction? (2019)
Solution:
A catalyst lowers the activation energy of a reaction, thereby increasing the reaction rate.
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Q3. Which of the following statements is true regarding the Arrhenius equation? (2023)
Solution:
The Arrhenius equation relates temperature to the rate constant and includes activation energy.
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Q4. The half-life of a first-order reaction is independent of the initial concentration. What is the expression for the half-life?
Solution:
The half-life of a first-order reaction is given by t₁/₂ = 0.693/k.
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Q5. The rate of a reaction is defined as the change in concentration of a reactant or product per unit time. What is the general form of the rate equation? (2023)
Solution:
The general form of the rate equation is Rate = k[A]^n, where n is the order of the reaction.
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Q6. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines which of the following? (2020)
Solution:
This statement defines the rate law of a reaction.
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Q7. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life? (2022)
Solution:
The half-life of a first-order reaction is given by t₁/₂ = 0.693/k.
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Q8. The rate of a reaction is directly proportional to the concentration of one reactant raised to the power of 2. What is the order of the reaction? (2022)
Solution:
If the rate is proportional to the concentration of one reactant raised to the power of 2, the reaction is second order.
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Q9. What effect does increasing temperature have on the rate of a chemical reaction? (2023)
Solution:
Increasing temperature generally increases the rate of a chemical reaction due to higher kinetic energy.
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Q10. The half-life of a first-order reaction is independent of the initial concentration. What is the expression for the half-life (t1/2) of a first-order reaction? (2022)
Solution:
The half-life of a first-order reaction is given by the formula t1/2 = 0.693/k, where k is the rate constant.
