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 28 of 29
- A. First order reaction
- B. Second order reaction
- C. Third order reaction
- D. Zero order reaction
Explanation: In the zero-order reaction, the rate is independent of the concentration of reactants and hence, the units of rate and rate constant…
Correct answer: Zero order reaction- A. 2nd
- B. 3rd
- C. 1st
- D. Zero
Explanation: It is second order reaction. Ozone reacts readily with nitric oxide to yeild nitrogen dioxide and oxygen
Correct answer: 2nd- A. 1st order reaction
- B. 2nd order reaction
- C. Negative order of reaction
- D. Zero order of reaction
Explanation: The rate of reaction is inversely proportional to the concentration of the reactant in a second-order reaction (option b).
Correct answer: 2nd order reaction- A. a x b
- B. a - b
- C. b - a
- D. a + b
Explanation: The exponents a+b represents the order of reaction.
Correct answer: a + b- A. Direction of reaction
- B. Extent of reaction
- C. Order of reaction
- D. Temperature of reaction
Explanation: Option C "Order of Reaction " is the correct answer. Order of reaction may be defined as the number of molecules or reactants…
Correct answer: Order of reaction- A. Second order
- B. Zero order
- C. First order
- D. Third order
Explanation: In a second-order reaction, the relationship between half-life and concentration is such that the half-life is inversely proportional to…
Correct answer: Second order- A. Number of reactant molecules
- B. Number of moles of reactants
- C. Number of moles of products
- D. Order of Reactions
Explanation: The formula for the half-life of a reaction, t1/2 = 1 / [A(a(n-1))], includes the term (n-1), where n represents the order of the reaction.
Correct answer: Order of Reactions- A. It's in excess
- B. It's a solvent
- C. It's a solute
- D. Both A and B
Explanation: A Pseudo first-order reaction can be defined as a second-order or bimolecular reaction that is made to behave like a first-order reaction.
Correct answer: Both A and B549. The number of reacting molecules which changes their concentration in a chemical change is called:
- A. Extent of a reaction
- B. Order of a reaction
- C. Specific rate of a reaction
- D. Enthalpy of reaction
Explanation: The Order of reaction refers to the relationship between the rate of a chemical reaction and the concentration of the species taking part…
Correct answer: Order of a reaction- A. 2
- B. 0
- C. 1
- D. 3
Explanation: The given chemical reaction is: Rate = k[NO][O3] The order of a chemical reaction with respect to a specific reactant is determined by the…
Correct answer: 2- A. Conditions of temperature
- B. Initial Concentration of the compound
- C. Presence of Catalyst
- D. All of these
Explanation: Half-life ( t1/2t1/2 ) is a timescale on which the initial population is decreased by half of its original value notice that, for…
Correct answer: Initial Concentration of the compound- A. Has fixed value at fixed temperature
- B. Changes with change in temperature
- C. Does not depend upon concentration of reactants
- D. None of the above
Explanation: The explanation for this question will be added soon.
Correct answer: None of the above- A. Unit rate constant
- B. Specific rate constant
- C. Relative rate constant
- D. Average rate constant
Explanation: A specific rate constant at a given temperature may be defined as the rate of reaction when the molar concentration of each reactant is…
Correct answer: Specific rate constant- A. It is independent of concentration of reactants.
- B. It depends upon the temperature.
- C. It does not depend upon the order of reaction.
- D. All of the above options are correct.
Explanation: Option a) "It is independent of the concentration of reactants" is not true about the rate of reaction.
Correct answer: It is independent of concentration of reactants.- A. Reaction time
- B. Reaction Speed
- C. Rate of reaction
- D. All of these options are correct
Explanation: A. Reaction time (Incorrect): Reaction time refers to the time it takes for a reaction to occur, not the rate of the reaction represented…
Correct answer: Rate of reaction- A. No units
- B. Unit of moles/dm3
- C. Unit of moles/litre
- D. Unit of moles/dm3s-1
Explanation: The formula for the rate of reaction is concentration/time. Unit for concentration is mol/dm3 and the unit for time is s.
Correct answer: Unit of moles/dm3s-1- A. Mole/ litre
- B. Moles/ gram
- C. Moles/ Second
- D. moles/dm3 s-1
Explanation: Reaction rates are usually expressed as the concentration of reactant consumed or the concentration of product formed per unit time.
Correct answer: moles/dm3 s-1- A. Reaction time
- B. Reaction Speed
- C. Rate of reaction
- D. All of these
Explanation: Correct option is C. The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional…
Correct answer: Rate of reaction- A. Temperature
- B. Pressure
- C. Time
- D. None of these options are correct
Explanation: dx/dt is the rate of change of concentration with respect to time. It is a mathematical expression that represents the change in the…
Correct answer: Time- A. At equilibrium
- B. One instant
- C. Given temperature
- D. Given pressure
Explanation: As the name indicates, the instantaneous rate of a reaction is the rate of the reaction at any instant. So option B is the correct option.
Correct answer: One instant