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 15 of 29
- A. 293K
- B. 283K
- C. 20° C
- D. 10° C
Explanation: Rate of reaction doubles for every 10°C rise in temperature.
Correct answer: 10° C- A. 2nd order reaction
- B. Pseudo 1 order reaction
- C. 1st order reaction
- D. 3rd order reaction
Explanation: Experimental rate equation is called rate law. According to rate law equation, order is 2nd with respect to "A" while order is zero with…
Correct answer: 2nd order reaction- A. Very fast reaction
- B. Very slow reaction
- C. Moderately reaction
- D. Not predicted
Explanation: It is rusting of iron so it is very slow process
Correct answer: Very slow reaction- A. Spectrometric method
- B. Dilatometric method
- C. Optical rotation method
- D. Electrical conductivity method
Explanation: The rate of reactions which involve ions is measured by the electrical conductivity method.
Correct answer: Electrical conductivity method- A. Refractometric method
- B. Dilatometric method
- C. Optical rotation method
- D. Spectrometric method
Explanation: Dilatometire method is applicable for the measurement of rate of those reactions which involve small volume change in the solutions.
Correct answer: Dilatometric method- A. Less than unity
- B. Greater than unity
- C. Equal to unity
- D. Equal to the concentration of 2nd order reaction
Explanation: The rate of reaction when the concentrations of reactants are unity is called Specific rate constant or velocity constant.
Correct answer: Equal to unity- A. mol dm-3 sec-1
- B. sec-1
- C. mol-2 dm+6
- D. mole-1dm+3 sec-1
Explanation: For reaction with order 2, the unit of rate constant is M-1 s-1 (or) L mol-1 s-1.
Correct answer: mole-1dm+3 sec-1- A. One of the reactants is limiting
- B. One of the reactants is in large excess
- C. None of the reactants is in large excess
- D. Both reactants in large excess
Explanation: The substance taken in small amount controls the rate and the order is noted with respect to that substance. If the cone.
Correct answer: One of the reactants is in large excess289. For a reaction A+2B ----> C, rate is given by Rate = k[A][B], hence the order of the reaction is:
- A. 3
- B. 2
- C. 1
- D. 0
Explanation: Rate = k [A][B] the sum of the exponents of concentration terms in given rate law equation is two.
Correct answer: 2- A. Rate = k[A][B]2
- B. Rate = k[A][B]
- C. R = k[A]1/2 [B]2
- D. Rate = k[A]2[B]
Explanation: It is overall 3rd order reaction. With respect to A, it is 2nd order reaction with respect to B is 1st order
Correct answer: Rate = k[A]2[B]- A. 0.693/K
- B. a/2K
- C. 1/Ka
- D. 1.5/Ka2
Explanation: For zero order reaction half-life period is directly proportional to the initial concentration of reactant.
Correct answer: a/2K- A. Zero order
- B. 1st order
- C. 2nd order
- D. 3rd order
Explanation: Half life is inversely proportional in second order reaction.
Correct answer: 2nd order- A. an+1
- B. a1-n
- C. an
- D. an-1
Explanation: Zero order reaction is directly proportional to half life
Correct answer: a1-n- A. 1
- B. 2
- C. 3
- D. 0
Explanation: It shows a zero order reaction in which all photochemical reactions take place.
Correct answer: 0- A. Includes the average kinetic energy of the reaction
- B. Is in addition to the average K.E. of the reactants
- C. Is in addition to the average K.E. of the products
- D. Required for effective collisions
Explanation: The minimum amount of energy required by the colliding molecules for effective collision is called activation energy.
Correct answer: Required for effective collisions- A. During a chemical reaction the particles must collide
- B. Reaction between the colliding particles can only take place if upon collision they possess the activation energy
- C. Only those collisions are effective which take place in proper orientation
- D. All statements are correct
Explanation: All the given statements are correct (during a chemical reaction the particles must collide, reaction between the colliding particles can…
Correct answer: All statements are correct- A. Can be less than or more than Ea
- B. Is always double of Ea
- C. Is negative of Ea
- D. Is always less than Ea
Explanation: (i) For exothermic reaction, energy of activation for forward reaction is less than the energy of activation for backward reaction.
Correct answer: Can be less than or more than Ea- A. Low activation energy and fast reaction
- B. Low activation energy and slow reaction
- C. High activation energy and fast reaction
- D. High activation energy and slow reaction
Explanation: A high potential energy of the transition state implies that a significant amount of energy is required for the reactants to overcome the…
Correct answer: High activation energy and slow reaction- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Rate of reaciton is inversly proportional to the activaiton energy. Lower the activaiton energy reaction will be fast.
Correct answer: Option C- A. These are in pure crystalline state
- B. The activity of enzyme catalyst is inhibited by poison
- C. Enzyme Catalytic reaction have maximum rate at optimum temperature
- D. All of these
Explanation: All are the correct characterstics of enzyme catalysts.
Correct answer: All of these