Catalysts
  • 1. Catalysts are substances that increase the rate of a chemical reaction without being consumed in the process. They lower the activation energy required for the reaction to occur, allowing it to proceed more rapidly or at a lower temperature. Catalysts work by providing an alternative pathway for the reaction to take place, resulting in the formation of products more efficiently. They are essential in many industrial processes, such as in the production of fuels, chemicals, and pharmaceuticals, as they help to enhance reaction rates and efficiency while reducing energy consumption and waste generation. Overall, catalysts play a crucial role in accelerating reactions and improving the sustainability of chemical processes.

    What is a catalyst?
A) A substance that stops a chemical reaction from occurring.
B) A substance that increases the rate of a chemical reaction without being consumed in the process.
C) A substance that reacts with another substance to form a new compound.
D) A substance that decreases the rate of a chemical reaction.
  • 2. What is an enzyme in biological systems?
A) A structural protein
B) A biological catalyst
C) A lipid molecule
D) A neurotransmitter
  • 3. What is the role of a promoter in catalysis?
A) To replace the catalyst in a reaction
B) To enhance the catalytic activity of a catalyst
C) To change the chemical nature of the catalyst
D) To inhibit the catalytic activity of a catalyst
  • 4. What is the major advantage of using catalysts in chemical reactions?
A) Making the reactions more hazardous
B) Lowering the activation energy and increasing reaction rates
C) Increasing the production cost
D) Causing more waste to be generated
  • 5. What does 'autocatalysis' refer to in a chemical reaction?
A) When a catalyst is deactivated by the reaction mixture
B) When a byproduct of a reaction poisons the catalyst
C) When a reactant of a reaction accelerates the reaction
D) When a product of a reaction acts as a catalyst for that reaction
  • 6. What is a common example of an organic catalyst?
A) Magnesium oxide
B) Silver
C) Carbon nanotubes
D) Enzymes
  • 7. What is the purpose of a catalytic converter in a car exhaust system?
A) To increase the fuel efficiency of the engine
B) To increase engine power
C) To produce more greenhouse gases
D) To reduce harmful emissions by converting them into less harmful substances
  • 8. Which of the following factors can influence the effectiveness of a catalyst?
A) Temperature of the surrounding environment
B) Vessel size in which the reaction takes place
C) Surface area of the catalyst
D) Color of the catalyst
  • 9. What is meant by the term 'selectivity' in catalysis?
A) The speed at which a catalyst degrades
B) The ease of recycling the catalyst
C) The ability of a catalyst to promote one specific reaction pathway over others
D) The cost of the catalyst used in a reaction
  • 10. How do solid catalysts differ from homogeneous catalysts?
A) Solid catalysts are always less efficient than homogeneous catalysts
B) Solid catalysts are typically easier to separate from the reaction mixture
C) Solid catalysts have a higher reaction selectivity
D) Solid catalysts are never used in industrial processes
  • 11. From which language is the term 'catalyst' derived and what does it mean?
A) French, meaning 'to change'.
B) Latin, meaning 'to speed up'.
C) German, meaning 'to assist'.
D) Greek, meaning 'loosen' or 'untie'.
  • 12. What is the SI derived unit for measuring the catalytic activity of a catalyst?
A) mole per second
B) katal
C) enzyme unit
D) turnover number (TON)
  • 13. Which term describes the productivity of a catalyst?
A) enzyme unit
B) katal
C) turnover number (TON)
D) turn over frequency
  • 14. In the reaction 2 SO2 + O2 → 2 SO3, which substance acts as a catalyst?
A) sulfur dioxide (SO2)
B) sulfur trioxide (SO3)
C) nitric oxide (NO)
D) oxygen (O2)
  • 15. What is a common product of enzymatic reactions that also acts as a reactant in bond-breaking processes?
A) Oxygen
B) Hydrogen
C) Carbon dioxide
D) Water
  • 16. What are catalytic antibodies that lower the activation energy of a chemical reaction called?
A) Ribozymes
B) Enzybiotics
C) Synzymes
D) Abzymes
  • 17. Who discovered the acid-catalyzed conversion of starch to glucose?
A) Wilhelm Ostwald
B) Gottlieb Kirchhoff
C) Vladimir Ipatieff
D) Jöns Jakob Berzelius
  • 18. What is the role of a catalyst in lowering activation energy?
A) It stabilizes the transition state more than the starting material
B) It increases the difference in energy between starting materials and products
C) It decreases the available energy from the environment
D) It changes the thermodynamic barrier
  • 19. Which enzyme-based commodity chemical is prepared using biocatalysis?
A) Acetic acid
B) High-fructose corn syrup
C) Ethanol
D) Benzene
  • 20. Who discovered the use of platinum in catalysis?
A) Humphry Davy
B) Gottlieb Kirchhoff
C) Vladimir Ipatieff
D) Johann Wolfgang Döbereiner
  • 21. Which chemist developed Döbereiner's lamp?
A) Johann Wolfgang Döbereiner
B) Wilhelm Ostwald
C) Humphry Davy
D) Elizabeth Fulhame
  • 22. Which process involves the synthesis of hydrocarbons from synthesis gas?
A) Fischer–Tropsch synthesis
B) Sabatier reaction
C) Steam reforming
D) Water-gas shift reaction
  • 23. Which step is the rate-determining step in the catalyzed reaction of SO2 and O2?
A) NO2 + SO2 → NO + SO3
B) 2 SO2 + O2 → 2 SO3
C) 2 NO + O2 → 2 NO2
D) NO + SO3 → NO2 + SO2
  • 24. What type of catalysis is used to derive polyesters, polyamides, and isocyanates?
A) Inorganic catalysts
B) Biocatalysts
C) Acid–base catalysis
D) Metal catalysts
  • 25. In 2005, how much did catalytic processes generate in products worldwide?
A) $900 billion
B) $500 billion
C) $1 trillion
D) $700 billion
  • 26. What is the precursor to the antibacterial levofloxacin synthesized using BINAP-ruthenium complexes?
A) Levofloxacin
B) Noyori asymmetric hydrogenation
C) (R)-1,2-Propandiol
D) Hydroxyacetone
  • 27. What is typically produced by photocatalysis?
A) Chlorine gas
B) Hydrogen peroxide
C) Nitric oxide
D) Singlet oxygen
  • 28. Which chemist referred to catalysis as contact processes?
A) Elizabeth Fulhame
B) Humphry Davy
C) Johann Wolfgang Döbereiner
D) Eilhard Mitscherlich
  • 29. Which type of catalysis is used in food processing to prepare many foodstuffs?
A) Enantioselective catalysis
B) Hydrogenation with nickel catalyst
C) Friedel–Crafts reactions
D) Biocatalysis
  • 30. What is produced via catalytic oxidation using oxygen from p-xylene?
A) Acrylic acid
B) Methanol
C) Ammonia
D) Terephthalic acid
  • 31. Who was awarded the 1909 Nobel Prize in Chemistry for work on catalysis?
A) Vladimir Ipatieff
B) Wilhelm Ostwald
C) Jöns Jakob Berzelius
D) Elizabeth Fulhame
  • 32. Who performed early industrial scale reactions including hydrogenation?
A) Gottlieb Kirchhoff
B) Vladimir Ipatieff
C) Wilhelm Ostwald
D) Jöns Jakob Berzelius
  • 33. Which type of catalyst can be considered an intermediate between homogeneous and heterogeneous catalysts?
A) Photocatalysts
B) Biocatalysts
C) Organometallic catalysts
D) Electrocatalysts
  • 34. Which process requires metal catalysts for carbonylation, such as the Monsanto acetic acid process?
A) Fischer–Tropsch synthesis
B) Carbonylation processes
C) Water-gas shift reaction
D) Sabatier reaction
  • 35. Who first used the term 'catalysis' to describe accelerated reactions?
A) Eilhard Mitscherlich
B) Elizabeth Fulhame
C) Jöns Jakob Berzelius
D) Gottlieb Kirchhoff
  • 36. In which year did Elizabeth Fulhame describe the concept of catalysis?
A) 1880s
B) 1794
C) 1835
D) 1811
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