Quiz  /  Rate of Reaction Class 9 MCQ Questions With Answers

  • 1. 
    Diagram 12 shows an energy profile diagram. Ea is the activation energy for the decomposition of hydrogen peroxide. PWhich of the following is the activation energy for the dissociation of hydrogen peroxide when manganese(IV) oxide is added?

  • P
  • Q
  • R
  • S

  • 2. 
    An experiment is carried out to study the effect of concentration on the rate of reaction between sodium thiosulphate and hydrochloric acid.Graph of the concentration of sodium thiosulphate against 1/time is as shown.Based on the graph, what is the value of t if the experiment is repeated using sodiumthiosulphate solution 0.025 mol dm-3.

  • 32.3 s
  • 50.0 s
  • 0.020 s
  • 0.031s

  • 3. 
    Which of the following reactions occurs at the highest rate?

  • Photosynthesis
  • Rusting of iron
  • Combustion of hydrogen in oxygen
  • Combustion of magnesium in oxygen

  • 4. 
    Table 4 shows the total volume of gas evolved at different intervals for the dissociation of hydrogen peroxide.What is the average rate of reaction in the second minute?

  • 14.0 cm3 min-1
  • 16.0 cm3 min-1
  • 18.0 cm3 min-1
  • 28.0 cm3 min-1

  • 5. 
    Increasing the temperature gives particles more __________.

  • Time
  • Energy
  • Space
  • Frequency

  • 6. 
    Why does a higher temperature increase the rate of a reaction?

  • it increases both the frequency and energy of particle collisions
  • it only increases the frequency of particle collisions
  • it only increases the energy of particle collisions
  • it reduces the activation energy of the reaction

  • 7. 
    Which manufacturing of the following is not a characteristic of catalyst?

  • A catalyst is specific in its reaction.
  • A catalyst influences the quantity of product of a reaction.
  • The chemical property of a catalyst remains unchanged at the end of the reaction.
  • Only a little amount of a catalyst is needed to influence the rate of reaction.

  • 8. 
    Diagram 4 shows the graph of volume of carbon dioxide gas against time when 5 g of marble chips is added to 50 cm3 of 0.2 mol dm-3 hydrochloric acid. At what time the rate of reaction the highest?

  • t1
  • t2
  • t3
  • t4

  • 9. 
    Figure 12 shows the apparatus set-up to determine the rate of reaction between calcium carbonate and hydrochloric acid. Which of the following is not correct in the apparatus set-up for this experiment?

  • Position of the delivery tube in the conical flask.
  • Position of thistle funnel
  • Position of the delivery tube in the basin.
  • Both A & B

  • 10. 
    In an experiment, 25 cm3 of 0.2 mol dm-3 hydrogen peroxide solution decomposes to produce oxygen gas. Graph of volume of oxygen gas against time is sketched and curve R is obtained as shown in Diagram 12.Which of the following solution will produce curve S?

  • 20 cm3 of 0.10 mol dm-3 hydrogen peroxide
  • 30 cm3 of 0.20 mol dm-3 hydrogen peroxide
  • 20 cm3 of 0.30 mol dm-3 hydrogen peroxide
  • 10 cm3 of 0.30 mol dm-3 hydrogen peroxide

  • 11. 
    Diagram 7 shows a graph of the volume of gas produced against time for the reaction between zinc granules and hydrochloric acid.The gradient of the graph decreases with time because

  • catalyst is not used
  • volume of mixture decreases
  • temperature of reaction decreases
  • concentration of hydrochloric acid decreases

  • 12. 
    Magnesium reacts with acid to produce hydrogen gas, H2.Which solution would give the highest initial rate of reaction?

  • 100 cm3 of 1.0 mol dm-3 of nitric acid, HNO3
  • 100 cm3 of 1.0 mol dm-3 of hydrochloric acid, HCl
  • 100 cm3 of 1.0 mol dm-3 of sulphuric acid, H2SO4
  • 100 cm3 of 1.0 mol dm-3 of ethanoic acid, CH3COOH

  • 13. 
    More collisions correspond to a:

  • Faster reaction rate
  • Slower reaction rate
  • Constant reaction rate
  • None of the above

  • 14. 
    A temperature increase causes the particles to ......

  • to slow down
  • move faster
  • collide higher
  • in the right order

  • 15. 
    The rate of a reaction is how _____________ a reaction occurs.

  • Quickly
  • Easily
  • Unusually
  • Differently

  • 16. 
    Substance that changes the rate of a chemical reaction without being consumed in the reaction

  • bonding
  • catalyst
  • chemical reaction
  • activation energy

  • 17. 
    Adding a catalyst ___________ the activation energy.

  • Raises
  • Lowers
  • Doesn't affect
  • Inreases
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