Here we will provide you the 50+ MCQ Questions of Chemical Kinetics for NEET-UG. Chemical Kinetics is the chapter in Class XI or Class 11 Chemistry NCERT Unit Chemical Kinetics NEET (conducted by NTA) is based on the NCERT book.
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Chemical Kinetics NEET MCQ
Which of the following factors affect the rate of a chemical reaction?
a) Temperature and pressure
b) Temperature and concentration
c) Concentration and pressure
d) All of the above
Answer:b) Temperature and concentration
The rate of a chemical reaction depends on:
a) The rate of the slowest step in the reaction
b) The activation energy of the reaction
c) The concentration of the reactants
d) All of the above
Answer: d) All of the above
Which of the following is not a unit of rate of reaction?
a) mol/L
b) s^-1
c) kJ/mol
d) g/L
Answer c) kJ/mol
The rate law for a reaction is given by the equation rate = k[A]^2[B]. What is the overall order of the reaction?
a) First order
b) Second order
c) Third order
d) Fourth order
Answer:b) Second order
Which of the following is an example of a zero-order reaction?
a) Radioactive decay
b) First-order reaction
c) Second-order reaction
d) All of the above
Answer:a) Radioactive decay
The half-life of a first-order reaction is:
a) Dependent on the initial concentration of the reactant
b) Constant
c) Dependent on the activation energy of the reaction
d) None of the above
Answer:b) Constant
Which of the following factors does not affect the rate constant of a reaction?
a) Temperature
b) Catalysts
c) Concentration of reactants
d) Pressure
Answer:d) Pressure
Which of the following is true about the activation energy of a reaction?
a) It is the energy required to initiate a reaction
b) It is the energy released during a reaction
c) It is the energy required to stop a reaction
d) It is the energy required to complete a reaction
Answer:a) It is the energy required to initiate a reaction
The Arrhenius equation relates the rate constant of a reaction to which of the following?
a) Temperature
b) Pressure
c) Concentration of reactants
d) Activation energy
Answer:a) Temperature
Which of the following is true about a catalyst?
a) It increases the activation energy of a reaction
b) It decreases the activation energy of a reaction
c) It does not affect the activation energy of a reaction
d) It slows down the reaction
Answer:b) It decreases the activation energy of a reaction
The rate of a reaction can be determined by measuring:
a) The change in concentration of the reactants
b) The change in concentration of the products
c) The amount of heat released or absorbed during the reaction
d) All of the above
Answer:d) All of the above
Which of the following is not a method for determining the order of a reaction?
a) Initial rate method
b) Integrated rate method
c) Half-life method
d) None of the above
Answer:d) None of the above
Which of the following statements is true about a reaction that has a negative rate constant?
a) The reaction is exothermic
b) The reaction is endothermic
c) The reaction is spontaneous
d) The reaction is non-spontaneous
Answer:d) The reaction is non-spontaneous
The rate constant for a reaction is 1.5 x 10^-3 s^-1 at 25°C. What will be the rate constant at 35°C if the activation energy for the reaction is 40 kJ/mol?
a) 2.4 x 10^-3 s^-1
b) 3.6 x 10^-3 s^-1
c) 1.0 x 10^-3 s^-1
d) 6.0 x 10^-3 s^-1
Answer:Answer: b) 3.6 x 10^-3 s^-1 Explanation: Using the Arrhenius equation: k2/k1 = e^(-Ea/R) x (T2/T1)^(-1/2) where k1 = rate constant at 25°C = 1.5 x 10^-3 s^-1 k2 = rate constant at 35°C (unknown) Ea = activation energy = 40 kJ/mol R = gas constant = 8.314 J/mol.K T1 = 25°C + 273 = 298 K T2 = 35°C + 273 = 308 K k2/1.5 x 10^-3 s^-1 = e^(-40 x 10^3 J/mol / (8.314 J/mol.K x 298 K)) x (308 K/298 K)^(-1/2) k2 = 3.6 x 10^-3 s^-1
Which of the following is a correct statement about a first-order reaction?
a) The rate of reaction is directly proportional to the concentration of the reactant
b) The rate of reaction is inversely proportional to the concentration of the reactant
c) The rate of reaction is independent of the concentration of the reactant
d) The rate of reaction is proportional to the square of the concentration of the reactant
Answer:a) The rate of reaction is directly proportional to the concentration of the reactant
For a first-order reaction, the half-life of the reaction is:
a) Dependent on the initial concentration of the reactant
b) Independent of the initial concentration of the reactant
c) Inversely proportional to the initial concentration of the reactant
d) None of the above
Answer:b) Independent of the initial concentration of the reactant
The reaction A + 2B → C has a rate law of rate = k[A][B]^2. What is the order of the reaction with respect to B?
a) First order
b) Second order
c) Third order
d) Zero order
Answer:b) Second order
The reaction 2A + B → 3C has a rate law of rate = k[A]^2[B]. What is the overall order of the reaction?
a) First order
b) Second order
c) Third order
d) Fourth order
Answer:c) Third order
Which of the following statements is true about a catalyst in a reaction?
a) It increases the activation energy of the reaction
b) It decreases the activation energy of the reaction
c) It increases the equilibrium constant of the reaction
d) It decreases the rate of the reaction
Answer:b) It decreases the activation energy of the reaction
The rate of a chemical reaction can be increased by:
a) Increasing the concentration of the reactants
b) Increasing the temperature
c) Adding a catalyst
d) All of the above
Answer:d) All of the above
The rate of a reaction can be determined by measuring:
a) The change in concentration of reactants over time
b) The change in concentration of products over time
c) The change in pH over time
d) Both a and b
Answer:d) Both a and b
A reaction has an activation energy of 80 kJ/mol. What is the temperature at which the rate constant is 2.5 times its value at 25°C?
a) 36°C
b) 46°C
c) 56°C
d) 66°C
Answer:c) 56°C Explanation: Using the Arrhenius equation: ln(k2/k1) = (-Ea/R) x (1/T2 – 1/T1) where k1 = rate constant at 25°C (unknown) k2 = 2.5k1 (given) Ea = activation energy = 80 kJ/mol R = gas constant = 8.314 J/mol.K T1 = 25°C + 273 = 298 K ln(2.5k1/k1) = (-80 x 10^3 J/mol / 8.314 J/mol.K) x (1/T2 – 1/298 K) ln(2.5) = (-80 x 10^3 J/mol / 8.314 J/mol.K) x (1/T2 – 1/298 K) 1/T2 – 1/298 K = ln(2.5) x (8.314 J/mol.K / 80 x 10^3 J/mol) 1/T2 = 1/298 K + ln(2.5) x (8.314 J/mol.K / 80 x 10^3 J/mol) T2 = 56°C + 273 = 329 K
The rate of a reaction doubles when the concentration of the reactant is doubled. What is the order of the reaction?
a) Zero order
b) First order
c) Second order
d) Third order
Answer:b) First order
Which of the following is true for a zero-order reaction?
a) The rate of reaction is directly proportional to the concentration of the reactant
b) The rate of reaction is inversely proportional to the concentration of the reactant
c) The rate of reaction is independent of the concentration of the reactant
d) The rate of reaction is proportional to the square of the concentration of the reactant
Answer:c) The rate of reaction is independent of the concentration of the reactant
For a reaction A → B, the rate law is rate = k[A]. If the initial concentration of A is 2.0 M and after 10 seconds, the concentration of A decreases to 1.0 M, what is the half-life of the reaction?
a) 6.93 s
b) 8.14 s
c) 10.0 s
d) 13.9 s
Answer:a) 6.93 s
Which of the following factors affect the rate of a chemical reaction?
a) Temperature
b) Concentration of reactants
c) Surface area of reactants
d) All of the above
Answer:d) All of the above
The rate constant for a first-order reaction is 0.0056 s^-1. What is the half-life of the reaction?
a) 10.2 s
b) 29.9 s
c) 123.6 s
d) 246.3 s
Answer:b) 29.9 s Explanation: For a first-order reaction, t1/2 = ln(2)/k where k is the rate constant. t1/2 = ln(2)/0.0056 s^-1 = 123.6 s.
For a reaction A + B → C, the rate law is rate = k[A]^2[B]. What is the overall order of the reaction?
a) First order
b) Second order
c) Third order
d) Fourth order
Answer:c) Third order
Which of the following statements is true for an exothermic reaction?
a) The activation energy of the reaction is positive
b) The products have a higher enthalpy than the reactants
c) The reaction is endergonic
d) The entropy of the system decreases
Answer:b) The products have a higher enthalpy than the reactants
Which of the following is true for a reaction that has reached chemical equilibrium?
a) The rate of the forward reaction is equal to the rate of the reverse reaction
b) The concentrations of the reactants and products are constant
c) The Gibbs free energy of the system is at a minimum
d) All of the above
Answer:d) All of the above
The rate of a reaction can be increased by:
a) Increasing the temperature
b) Increasing the concentration of reactants
c) Adding a catalyst
d) All of the above
Answer d) All of the above
The rate law for a reaction is rate = k[A]^2[B]. If the concentration of B is doubled while the concentration of A remains the same, how does the rate of the reaction change?
a) It doubles
b) It quadruples
c) It becomes half
d) It becomes one-fourth
Answer:b) It quadruples
Which of the following statements is true for a reaction that is first-order with respect to a reactant?
a) The reaction rate is directly proportional to the concentration of the reactant
b) The reaction rate is inversely proportional to the concentration of the reactant
c) The reaction rate is independent of the concentration of the reactant
d) The reaction rate is proportional to the square of the concentration of the reactant
Answer:a) The reaction rate is directly proportional to the concentration of the reactant.
We hope there NEET MCQ of Class 11 Chapter 4 Chemical Kinetics will help you to score an excellent rank in NEET-UG. If you have any queries feel free to write in the comments section. We at Study Rate are always ready to serve our students.
