Catalyst and Catalysis - MCQ

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