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Catalyst and Catalysis - MCQ

Dear Readers,

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. Mark the correct statement in a reversible reaction

  •  The catalyst catalyses the forward reaction
  •  The catalyst catalyses the backward reaction
  •  The catalyst influences the direct and the reverse reaction to the same extent
  •  The catalyst increases the rate of forward reaction and decreases the rate of backward reaction

Q2. A catalyst is used

  •  Only for increasing the velocity of the reaction
  •  For altering the velocity of the reaction
  •  Only for decreasing the velocity of the reaction
  •  All (a), (b) and (c) are correct

Q3. A catalyst is a substance which

  •  Alters the equilibrium in a reaction
  •  Is always in the same phase as the reactants
  •  Participates in the reaction and provides easier pathway for the same
  •  Does not participate in the reaction but speeds it up

Q4. In Haber's process for the manufacture of ammonia

  •  Finely divided iron is used as catalyst
  •  Finely divided molybdenum is used as catalyst
  •  Finely divided nickel is used as catalyst
  •  No catalyst is necessary

Q5. When KClO3 is heated, it decomposes into KCl+O2 . If some MnO2 is added, the reaction goes much faster because

  •  MnO2 decomposes to give O2
  •  MnO2 provides heat by reacting
  •  Better contact is provided by MnO2
  •  MnO2 acts as a catalyst

Q6. Reactions in Zeolite catalysts depend on

  •  Pores
  •  Apertures
  •  Size of cavities
  •  All of these

Q7. What is the role of a catalyst in a catalysed reaction?

  •  Lowers the activation energy
  •  Increases the activation energy
  •  Affects the free energy change
  •  Affects the enthalpy change

Q8. The catalyst used in the lead chamber process of sulphuric acid manufacture is

  •  Platinum
  •  Oxide of nitrogen
  •  Nickel
  •  Vanadium

Q9. Enzymes with two sites are called

  •  Apoenzyme
  •  Holoenzyme
  •  Allosteric enzyme
  •  Conjugate enzyme

Q10. Which of the following types of metals make the most efficient catalysts

  •  Alkali metals
  •  Transition metals
  •  Alkaline–earth metals
  •  Radioactive metals


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