Chemical kinetics mcq is a crucial chapter in physical chemistry, forming a fundamental part of the NEET syllabus. It deals with the speed of chemical reactions and the factors that affect them. NEET aspirants must have a deep understanding of reaction rates, rate laws, order of reaction, molecularity, activation energy, and temperature dependence of reactions.
To help you excel in this topic, here is an extensive collection of multiple-choice questions (MCQs) on chemical kinetics, along with their answers and explanations. Solve these questions to test and strengthen your knowledge of NEET.
1. Basics of Chemical Kinetics MCQ
Q1. What does chemical kinetics study?
a) The energy changes in a reaction
b) The rate of a reaction and factors affecting it
c) The equilibrium position of a reaction
d) The spontaneity of a reaction
Answer: b) The rate of a reaction and factors affecting it
Explanation: Chemical kinetics focuses on the speed of reactions and how variables like temperature, concentration, and catalysts influence the reaction rate.
Q2. The rate of a reaction is defined as:
a) The time required for the reaction to complete
b) The change in concentration of reactants or products per unit time
c) The heat released or absorbed in a reaction
d) The final state of a chemical system
Answer: b) The change in concentration of reactants or products per unit time
Explanation: Reaction rate is measured by the rate at which reactants decrease or products increase over time.
2. Rate of Reaction and Rate Law
Q3. The unit of the rate of a chemical reaction is:
a) mol L⁻¹
b) mol⁻¹ L s⁻¹
c) mol L⁻¹ s⁻¹
d) s⁻¹
Answer: c) mol L⁻¹ s⁻¹
Explanation: Reaction rate is measured in terms of change in concentration (mol L⁻¹) per unit time (s).
Q4. The rate law for a reaction A + B → Products is given by:
Rate = k[A]²[B]. What is the order of the reaction?
a) 1
b) 2
c) 3
d) 0
Answer: c) 3
Explanation: The overall order is the sum of the exponents in the rate law: 2 (for A) + 1 (for B) = 3.
3. Molecularity and Order of Reaction
Q5. The molecularity of a reaction is:
a) Always a whole number
b) Can be a fraction
c) Can be zero
d) Can be negative
Answer: a) Always a whole number
Explanation: Molecularity refers to the number of molecules involved in an elementary step and is always a whole number.
Q6. A reaction is found to be first order to reactant A. If the concentration of A is doubled, the rate of reaction will:
a) Remain unchanged
b) Become double
c) Become four times
d) Reduce to half
Answer: b) Become double
Explanation: For a first-order reaction, rate ∝ [A]. If [A] is doubled, the rate also doubles.
4. Half-Life and Integrated Rate Laws
Q7. The half-life of a first-order reaction:
a) Increases with time
b) Decreases with time
c) Remains constant
d) Depends on the initial concentration of the reactant
Answer: c) Remains constant
Explanation: The half-life of a first-order reaction is independent of initial concentration and given by t₁/₂ = 0.693/k.
Q8. The half-life of a second-order reaction is:
a) Independent of initial concentration
b) Directly proportional to initial concentration
c) Inversely proportional to initial concentration
d) Independent of rate constant
Answer: c) Inversely proportional to initial concentration
Explanation: For a second-order reaction, t₁/₂ = 1 / (k[A]₀), meaning it decreases as concentration increases.
5. Temperature Dependence and Arrhenius Equation
Q9. According to the Arrhenius equation, rate constant k is given by:
a) k = Ae^(-Ea/RT)
b) k = A + RT/Ea
c) k = A × RT × Ea
d) k = A × Ea/RT
Answer: a) k = Ae^(-Ea/RT)
Explanation: The Arrhenius equation relates temperature and activation energy to the rate constant.
Q10. If the temperature of a reaction increases, the rate constant:
a) Decreases
b) Remains the same
c) Increases
d) Becomes zero
Answer: c) Increases
Explanation: An increase in temperature provides more molecules with energy greater than or equal to the activation energy, increasing the reaction rate.
6. Catalyst and Activation Energy
Q11. A catalyst:
a) Increases activation energy
b) Decreases activation energy
c) Does not affect activation energy
d) Increases the energy of reactants
Answer: b) Decreases activation energy
Explanation: A catalyst provides an alternative pathway with lower activation energy, increasing reaction rate.
Q12. Which of the following statements is true regarding a catalyst?
a) It alters the equilibrium position
b) It gets consumed in the reaction
c) It increases the rate of reaction by lowering activation energy
d) It increases the reaction enthalpy
Answer: c) It increases the rate of reaction by lowering activation energy
Explanation: A catalyst speeds up a reaction by providing an alternative pathway with lower activation energy, without getting consumed.
7. Zero-Order and First-Order Reactions
Q13. The rate of a zero-order reaction:
a) Depends on reactant concentration
b) Is constant throughout the reaction
c) Increases with time
d) Decreases with time
Answer: b) Is constant throughout the reaction
Explanation: In zero-order reactions, the rate is independent of reactant concentration and remains constant.
Q14. The rate constant of a first-order reaction has the unit:
a) mol L⁻¹ s⁻¹
b) s⁻¹
c) L mol⁻¹ s⁻¹
d) mol s⁻¹
Answer: b) s⁻¹
Explanation: The unit of a first-order rate constant is time⁻¹, i.e., s⁻¹.
8. Collision Theory and Reaction Mechanism
Q15. According to the collision theory, a reaction occurs when:
a) Reactants collide with proper orientation and sufficient energy
b) Reactants collide at any energy level
c) Molecules vibrate within a bond
d) Reactants increase in mass
Answer: a) Reactants collide with proper orientation and sufficient energy
Explanation: Effective collisions require correct orientation and energy greater than activation energy.
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Conclusion
Chemical kinetics Mcq plays a vital role in understanding reaction mechanisms, rate laws, and the effect of external factors on reaction speed. Practicing MCQs regularly will help NEET aspirants master this topic and improve problem-solving skills.
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FAQs
Q1. What is the best way to study chemical kinetics for NEET?
A: Focus on conceptual clarity, practice MCQs, and understand rate laws, reaction order, and Arrhenius equation.
Q2. Why is the half-life of a first-order reaction constant?
A: Because it depends only on the rate constant and not on initial concentration.
Q3. How does a catalyst speed up a reaction?
A: By lowering the activation energy, allowing more molecules to react.
Q4. What is the significance of the Arrhenius equation?
A: It explains the relationship between rate constant, temperature, and activation energy.
Q5. Where can I find more NEET-level MCQs on chemical kinetics?
A: Neet World offers quality coaching, practice questions, and test series.
