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 18 of 29
- A. Theoretically
- B. Experimentally
- C. Summing up the exponents of rate equation
- D. All of these
Explanation: The correct answer is all of these as all the methods mentioned in the options can be used for determining the order of reaction.
Correct answer: All of these- A. Optical rotation method
- B. Electrical conductivity method
- C. Refractometry method
- D. Spectrometry
Explanation: The correct answer is D) Spectrometry, as it is the method used to measure the rate of a reaction by monitoring the amount of radiation…
Correct answer: Spectrometry- A. Concentration
- B. Change in concentration
- C. Very small change in concentration
- D. All of these
Explanation: The correct answer is C) Very small change in concentration, as "dx" represents a very small change in concentration during an…
Correct answer: Very small change in concentration- A. Unit rate constant
- B. Specific rate constant
- C. Relative rate constant
- D. Average rate constant
Explanation: Specific rate constant of a chemical reaction is the rate of reaction when the concentrations of the reactants are unity.
Correct answer: Specific rate constant- A. Higher than average rate
- B. Lower than average rate
- C. Equal than average rate
- D. None of these
Explanation: At the beginning of the reaction, there are typically more reactant molecules available, and they are more likely to collide with each…
Correct answer: Higher than average rate- A. Endothermic reaction
- B. Exothermic reaction
- C. Irreversible reaction
- D. Redox reaction
Explanation: The Haber process releases heat so, it is an exothermic reaction.
Correct answer: Exothermic reaction- A. Pressure
- B. Temperature
- C. Effective collision
- D. Ineffective collision
Explanation: An activated complex is formed when reactant molecules collide with enough energy and are in the correct orientation, to overcome the…
Correct answer: Effective collision- A. High
- B. Low
- C. Moderate
- D. Zero
Explanation: Initially, the rate of all reactions is high as there is a large amount of reactants present. As the reaction proceeds the rate decreases.
Correct answer: High- A. 112
- B. 400
- C. 512
- D. 614
Explanation: The rate of reaction is doubled for every 10°C rise in temperature. So, if the initial rate of reaction is r, then the rate of reaction at…
Correct answer: 512- A. Fast
- B. Slow
- C. Moderate
- D. Depends upon conditions
Explanation: Rusting of iron is a slow process because it involves the reaction of iron with oxygen and water to form iron oxide (rust).
Correct answer: Slow- A. Rate of reaction
- B. Direction of reaction
- C. Factor affecting rate of reaction
- D. Both a & c
Explanation: Reaction kinetics is concerned with both:the rate of the reaction and factors affecting the rate of reaction.
Correct answer: Both a & c- A. Stable
- B. Unstable
- C. Can be isolated
- D. Can exist as product
Explanation: Activated complex is an unstable combination of all the atoms involved in the reaction for which the energy is maximum.
Correct answer: Unstable353. For a reaction A -> product, doubling the concentration of A, quadruples the rate. The reaction is :
- A. First order
- B. Second order
- C. Zero order
- D. Third order
Explanation: If doubling the concentration of A, quadruples the rate, the reaction is second order with respect to A.
Correct answer: Second order- A. Mole dm-3 sec
- B. Bars sec
- C. Mole dm-3 sec-1
- D. Bars sec-1
Explanation: If gas is measured in bars, then the units of rate of reaction is bars per second (bar/s).
Correct answer: Bars sec-1- A. 10
- B. 20
- C. 15
- D. 25
Explanation: The rate of reaction is defines as the change in concentration of reactants or products divided by time ,hence the rate of reaction in…
Correct answer: 20- A. Rate of reaction
- B. Order of reaction
- C. Activated molecule
- D. Half-life
Explanation: The number of reacting molecules whose concentration changes during a reaction is called the order of reaction.
Correct answer: Order of reaction- A. Decrease in collisions
- B. Decrease in activation energy
- C. Increase in kinetic energy of the molecules
- D. More number of molecules attain activation energy
Explanation: As the temperature rises, a larger proportion of the molecules have energy equal to or greater than the activation energy, allowing them…
Correct answer: More number of molecules attain activation energy- A. Using less concentrated solution
- B. By lowering the temperature
- C. Using more concentrated solution
- D. Stopping stirring
Explanation: A more concentrated solution has a higher number of reactant particles in the same volume.
Correct answer: Using more concentrated solution- A. Heterogeneous
- B. Homogeneous
- C. Concentrated
- D. Positive analysis
Explanation: When the catalyst and reactants are in different physical phases, we call the catalysis heterogenous.
Correct answer: Heterogeneous- A. Decomposition of N2O5
- B. Formation of FeI2
- C. Formation or Glucose in plant
- D. Chlorination of methane in sunlight
Explanation: Explanation for this question will be added soon.
Correct answer: Formation of FeI2