Q1. What is the rate law for a reaction that is first order with respect to A and second order with respect to B? (2022) 2022
Solution:
The rate law is determined by the order of the reaction with respect to each reactant. For first order in A and second order in B, the rate law is Rate = k[A][B]^2.
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Q2. The half-life of a first-order reaction is given by which of the following expressions? (2020)
Solution:
For a first-order reaction, the half-life is constant and is given by the formula t1/2 = 0.693/k.
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Q3. In a zero-order reaction, the rate of reaction is independent of which of the following? (2023) 2023
Solution:
In a zero-order reaction, the rate is constant and does not depend on the concentration of the reactants.
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Q4. The half-life of a first-order reaction is dependent on which of the following? (2020) 2020
Solution:
The half-life of a first-order reaction is independent of the initial concentration and is directly proportional to the rate constant.
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Q5. If the rate of a reaction is given by rate = k[A]², what is the order of the reaction? (2021)
Solution:
The reaction is second-order because the rate depends on the square of the concentration of A.
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Q6. What is the rate law expression for a reaction that is second order with respect to reactant A? (2023)
Solution:
For a second order reaction with respect to A, the rate law is expressed as Rate = k[A]^2.
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Q7. For a reaction with an activation energy of 50 kJ/mol, what will happen to the rate if the temperature is increased by 20°C? (2022)
Solution:
Increasing the temperature generally increases the rate of reaction significantly due to higher kinetic energy.
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Q8. What is the rate law for a reaction that is second order with respect to reactant A? (2023)
Solution:
For a second order reaction with respect to A, the rate law is expressed as Rate = k[A]^2.
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Q9. What is the unit of the rate constant for a first-order reaction? (2023)
Solution:
The unit of the rate constant for a first-order reaction is s⁻¹.
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Q10. In a first-order reaction, if the half-life is constant, what can be said about the rate constant? (2023)
Solution:
In a first-order reaction, the half-life is constant, which indicates that the rate constant remains constant.
