Free Reaction Kinetics MCQs with Answers
573 Reaction Kinetics MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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573 questions · page 11 of 29
- A. Oxygen
- B. Hydrogen
- C. Water
- D. Air
Explanation: hydro means water and lysis means to break. Hence hydrolysis involves a reaction in which water is used
Correct answer: Water- A. Products
- B. Reactants
- C. Ions
- D. Radicals
Explanation: Zero order reaction is a reaction which is completely independent of the reactant.
Correct answer: Reactants- A. Same as the first-order reaction
- B. Different from first-order reactions
- C. Directly proportional to the concentration of reactants
- D. None of these options are correct
Explanation: For a 1st order reaction (Half life is constant.) For a second order reaction (Half life increases with decreasing concentration)
Correct answer: Different from first-order reactions- A. Experimental expression
- B. Theoretical expression
- C. Based on hit and trial
- D. All of these options are correct
Explanation: We take readings after doing 2-3 experiments and then find the order of the reaction and then make the equation for the rate.
Correct answer: Experimental expression- A. Change in temperature
- B. Change in pressure
- C. Change in volume
- D. Change in concentration
Explanation: Rate is the change in concentration per unit time. When the reactant is used up that means that the reaction is taking place.
Correct answer: Change in concentration- A. Time Constant
- B. Change in Temperature
- C. Change in Concentration
- D. Change in Pressure
Explanation: OPTION A: Specific Rate constant is independent of the time constant.OPTION B: According to Arrhenius's equation k = Ae -Ea/T ( k ∝ 1/Ea…
Correct answer: Change in Temperature- A. 40%
- B. 70%
- C. 50%
- D. 30%
Explanation: The percentage of reactants converted into products during one half-life is approximately 50%.
Correct answer: 50%- A. More Energy
- B. No energy
- C. Less Energy
- D. Catalyst
Explanation: Processes that release energy. energy is released because the total energy of the products is less than the total energy of the reactants.
Correct answer: Less Energy- A. First order reaction
- B. Zero Order Reaction
- C. Pseudo Second Order
- D. Pseudo First Order
Explanation: Answer: DReason: Pseudo-first-order reactions are those which can be defined as second-order reactions that can be made to behave as the…
Correct answer: First order reaction- A. Zero
- B. Infinite
- C. Same
- D. Positive
Explanation: Is correct as both are change of concentration with time .The only difference is that instantaneous is used over a small interval of time
Correct answer: Same- A. Rising curve
- B. Falling Curve
- C. Straight line
- D. None of these options is correct
Explanation: It is correct as initially the rate of reaction is high because of higher concentration of esters .A repeated analysis at various time…
Correct answer: Rising curve- A. Conditions of temperature
- B. Initial Concentration of the compound
- C. Presence of Catalyst
- D. All of these
Explanation: Is correct the N2O5 decomposition explains the independence of first order reaction perfectly This Is also written in the PTB book.
Correct answer: Initial Concentration of the compound- A. Direction of reaction
- B. Extent of Reaction
- C. Order of Reaction
- D. Temperature of Reaction
Explanation: In the rate equation the power to which the concentration of a specific reagent is raised indicates the order of reaction with respect to…
Correct answer: Order of Reaction- A. Experimental details
- B. Balanced chemical equation
- C. Molar ratio
- D. All of these
Explanation: Reason: The reaction mechanism is the overall sequence of the elementary reactions. It can be determined experimentally.
Correct answer: Experimental details- A. 2
- B. 0
- C. 1
- D. 3
Explanation: Option ARate =k[No][O3] , since both have exponents equal to 1 therefore the overall rate of reaction i.e, a+b is 2.
Correct answer: 2- A. Fastest step
- B. Slowest Step
- C. Catalyst used
- D. Temperature of reaction
Explanation: Option B is correct since the rate of a chemical reaction depends on the slowest step in the reaction mechanism.
Correct answer: Slowest Step- A. A catalyst
- B. A graph
- C. A calculating software
- D. None of These
Explanation: Option B is correct since the graph is the easiest method of finding the rate of a reaction given the concentrations.
Correct answer: A graph- A. Temperature
- B. Pressure
- C. Concentration
- D. All of these
Explanation: The half-life of a first-order reaction is independent of the initial concentration of the reactant.
Correct answer: Concentration- A. Disappearance of reactants
- B. Formation of products
- C. A given time
- D. All of these options are correct
Explanation: The rate expression has a negative sign for reactants because the rate of a reaction is defined as the change in the concentration of…
Correct answer: Disappearance of reactants- A. With different sizes of triangles drawn
- B. At different points on curve
- C. At the start and end of curve
- D. All of these
Explanation: The slope determined by drawing a right angled triangle with the tangent as the hypotenuse will not be exactly the same for different…
Correct answer: With different sizes of triangles drawn