Here are some MCQs related to radical polymerization along with their answers:
MCQ 1: What is the primary initiator used in radical polymerization?
a) Anionic initiator
b) Cationic initiator
c) Radical initiator
d) Ionic initiator
Answer: c) Radical initiator
MCQ 2: Which of the following is NOT a common radical initiator?
a) Benzoyl peroxide
b) AIBN (Azobisisobutyronitrile)
c) Sodium hydroxide
d) Potassium persulfate
Answer: c) Sodium hydroxide
MCQ 3:In radical polymerization, what type of bond forms between monomer units?
a) Ionic bonds
b) Covalent bonds
c) Metallic bonds
d) Hydrogen bonds
Answer: b) Covalent bonds
MCQ 4: At which stage of radical polymerization do initiation, propagation, and termination occur simultaneously?
a) Initiation
b) Propagation
c) Termination
d) Chain transfer
Answer: c) Termination
**MCQ 5:** Which polymerization technique typically requires elevated temperatures and can be initiated by heat, light, or chemical initiators?
a) Anionic polymerization
b) Cationic polymerization
c) Radical polymerization
d) Coordination polymerization
Answer: c) Radical polymerization
MCQ 6: What is the main advantage of radical polymerization over other polymerization techniques?
a) Precise control of molecular weight
b) High polymerization rate
c) No need for initiators
d) Low energy requirements
Answer:b) High polymerization rate
MCQ 7: Which of the following is a common free radical initiator used in radical polymerization?
a) Sodium chloride
b) Potassium hydroxide
c) Benzoyl peroxide
d) Sulfuric acid
Answer: c) Benzoyl peroxide
MCQ 8: What is the role of chain transfer agents in radical polymerization?
a) Initiate the polymerization reaction
b) Increase the rate of propagation
c) Terminate the polymerization reaction
d) Control the length of the polymer chains
Answer:d) Control the length of the polymer chains
MCQ 9:In radical polymerization, what type of radical is formed during initiation?
a) Anionic radical
b) Cationic radical
c) Stable radical
d) Initiator radical
Answer: d) Initiator radical
MCQ 10: What is the mechanism of chain propagation in radical polymerization?
a) Addition of monomers to growing polymer chain radicals
b) Elimination of monomers from polymer chain radicals
c) Breakage of polymer chains into smaller segments
d) Combination of polymer chains to form larger chains
Answer:a) Addition of monomers to growing polymer chain radicals
The equilibrium monomer concentration [ [M]e for radical polymerization of 1,3-butadiene at 77°C is.
[Given: AH° = - 77 kJ mol¹, AS°=-85 J mol¹ K¹]
a. 8.94 x 105
b. 8.94 x 10-8
c. 8.94 x 107
d. 8.94 x 10-9
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