CBSE  /  Class 12  /  Chemistry  /  Chemical Kinetics

  • 1. 
    Fora unimolecular reaction

  • the order and molecuiarity of the slowest step are equal to one
  • molecuiarity of the reaction can be zero, one or two
  • molecuiarity of the reaction can be determined only experimentally
  • more than one reacting species are involved in one step

  • 2. 
    The overall rate of a reaction is governed by

  • the rate of fastest intermediate’step
  • the sum total of the rates of all intermediate steps
  • the average of the rates of all the intermediate steps
  • the rate of slowest intermediate step

  • 3. 
    The order of reaction is decided by

  • temperature
  • mechanism of reaction as well as relative concentration of reactants
  • molecularity
  • pressure

  • 4. 
    Rate constant in case of first order reaction is

  • inversely proportional to the concentration units
  • independent of concentration units
  • directly proportional to concentration units
  • inversely proportional to the square of concentration units

  • 5. 
    Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?

  • 25%
  • 50%
  • 99.9%
  • 75%

  • 6. 
    In pseudo unimolecular reactions

  • both the reactants are present in low concentration
  • both the reactants are present in same concentration
  • one of the reactant is present in excess
  • one of the reactant is non-reactive

  • 7. 
    A first order reaction takes 40 min for 30% decomposition. What will be t

  • 77.7 min
  • 52.5 min
  • 46.2 min
  • 22.7 min

  • 8. 
    A first order reaction has a rate constant 1.15 × 10

  • 9. 
    Radioactive disintegration is an example of

  • zero order reaction
  • first order reaction
  • second order reaction
  • third order reaction

  • 10. 
    A plot of log (a – x) against time t is a straight line. This indicates that the reaction is of

  • zero order
  • first order
  • second order
  • third order
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