Quiz  /  Rate of Reaction Class 10 MCQ Questions With Answers

  • 1. 
    What criteria must be met for reactant collisions to result in a successful product?

  • The reactants must collide with each other
  • The reactants must collide with enough energy and be in the right positions
  • The reactants must have enough energy to form the activated complex

  • 2. 
    In an endothermic reaction, heat is ...

  • taken in
  • given out

  • 3. 
    Which among the following is NOT TRUE about the collision theory and the rate of reaction?

  • higher temperature ---> faster particle movements ---> more collision
  • higher concentration ---> more spaces between particles ---> more collision
  • higher surface area ---> more particle interactions ---> more collision

  • 4. 
    What is the meaning of the rate of reaction?

  • Decrease in amount of product
  • Decrease in amount of product against time
  • Increase in amount of products against time
  • Increase in amount of reactants against time

  • 5. 
    Which process has the highest rate of reaction?

  • Rusting
  • Respiration
  • Combustion
  • Photosynthesis

  • 6. 
    Which of the following is/are the fundamental idea(s) of collision theory?

  • Molecules react by colliding together
  • The effective collisions must occur with certain minimum amounts of energy
  • In a large sample, the greater the number of effective collisions, and the faster the rate of reaction
  • All of the above

  • 7. 
    Which of the following will lower the rateof reaction?

  • adding an enzyme to the reaction
  • decreasing the temperature from 40°C to10°C
  • breaking a chunk of calcium up intosmaller pieces
  • increasing the amount of solutedissolved in a solution

  • 8. 
    The rate of a chemical reaction is NOT affected by which of the following:

  • temperature
  • concentration
  • particle size (surface area)
  • All of these affect reaction rates

  • 9. 
    Products will form faster if____________

  • the particle size of the reactants are larger.
  • temperature is decreased.
  • concentration of the reactants are increased.
  • the reaction is not stirred.

  • 10. 
    What is the energy of the activated complex?

  • 50 kJ
  • 150 kJ
  • 200 kJ
  • 100 kJ
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