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 21 of 29
- A. Activation energy
- B. Properly orientation
- C. Concentration
- D. Activation energy and proper orientation
Explanation: Option D, "Activation energy and proper orientation," is correct because both activation energy and proper molecular orientation are…
Correct answer: Activation energy and proper orientation- A. 1
- B. 2
- C. 3
- D. 0
Explanation: The overall reaction for the decomposition of N2O5 is:N2O5 → 2NO2From the provided mechanism, we can see that the rate-determining step…
Correct answer: 1- A. mol.dm-3.s-1
- B. mol-1.dm3.s-1
- C. mol-2.dm3.s-1
- D. mol-1.s-1
Explanation: The units of "k" must be chosen to make the equation dimensionally consistent.
Correct answer: mol-1.dm3.s-1- A. s-1
- B. mol-1 dm3 s-1
- C. mol2 dm6 s-1
- D. mol dm-3 s-1
Explanation: In third-order reactions, the rate constant has units of mol2 dm6 s-1.
Correct answer: mol2 dm6 s-1- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In the reaction in option d, the catalyst and reactants are in the same phase i.e. gaseous.
Correct answer: Option D- A. Dilatometry
- B. Refractrometry
- C. Spectrometry
- D. Optical rotation
Explanation: Option d is the correct option. Optical rotation is the specific property of chiral (optically active) substances to rotate the plane of…
Correct answer: Optical rotation- A. Order
- B. Half-life
- C. Molecularity
- D. Rate constant
Explanation: "Molecularity," cannot be a fractional number because it refers to the number of molecules that must collide simultaneously in order for a…
Correct answer: Molecularity- A. 16 min
- B. 8 min
- C. 24 min
- D. 64 min
Explanation: 32 × 50/100 = 16 min Hence, option a is correct.
Correct answer: 16 min- A. Remain unchanged
- B. Increase four times
- C. Increase three times
- D. Double
Explanation: In a second-order reaction, the rate of reaction is directly proportional to the square of the concentration of the reactant.
Correct answer: Increase four times- A. They involve a simple chemical reaction
- B. They produce mass change
- C. They lower Ea physically
- D. They monitor some physical property
Explanation: Physical methods involve measuring or monitoring physical properties like temperature, pressure, volume, conductivity, color changes, etc.
Correct answer: They monitor some physical property- A. 16 grams
- B. 32 grams
- C. 2 grams
- D. 8 grams
Explanation: Explanation: The half life of a substance is the time taken by half of the substance to decay.
Correct answer: 8 grams- A. 3
- B. 1
- C. 0
- D. 2
Explanation: If the rate of reaction is equal to the rate constant, it implies that the reaction is zero-order with respect to the reactants.
Correct answer: 0- A. Slow moving molecules
- B. Polar molecules
- C. Collisions between molecules
- D. High Ea
Explanation: Collisions between molecules is the fundamental reason for reactions. For a chemical reaction to occur, molecules must collide with…
Correct answer: Collisions between molecules- A. Exothermic and endothermic reactions
- B. Endothermic reactions
- C. Exothermic reactions
- D. None of these
Explanation: Rate of reaction generally increases for both exothermic and endothermic reactions with temperature.
Correct answer: Exothermic and endothermic reactions- A. 512
- B. 400
- C. 256
- D. 112
Explanation: The increase in reaction rate as a result of increase in temperature from 10K to 90K is 256.
Correct answer: 256- A. Neutralization
- B. Redox
- C. Decomposition
- D. Ionic
Explanation: To summarize, the reaction AgCl + NH3 -> [Ag(NH3)2]Cl is not a fast reaction because there is no change in the oxidation number of any…
Correct answer: Redox- A. Rate = k[A][B]
- B. Rate = k[A][B]2
- C. Rate = k[A]2[B]
- D. Rate = k [B]2
Explanation: To calculate the order of A with respect to B take eq 1 & 2 [A2] / [A1] = 20 / 10 = 2 rate of reaction 2 / rate of reaction 1 = 4 x 10-5 /…
Correct answer: Rate = k[A][B]- A. Polarity of molecules
- B. Velocity constant
- C. Rate constant
- D. Effective collisions per second
Explanation: Effective collision per second affects the rate of reaction as it determines the number of reactant molecules having enough energy to…
Correct answer: Effective collisions per second- A. 2 moles min-1
- B. 4 moles min-1
- C. 8 moles min-1
- D. 3 moles min-1
Explanation: Stoichiometric ratio of SO2 : SO3 = 2 : 2 = 1 : 1 Rate of formation of SO3 = 2 moles min -1 As the ratio is 1 : 1 ∴ rate of formation of…
Correct answer: 2 moles min-1- A. Rate constant
- B. Volume
- C. Conditions
- D. Equilibrium point
Explanation: A number of factors including the concentration of reactants, the temperature and the presence of the catalyst affect the rate of…
Correct answer: Conditions