Q.1. The biodegradable polymer is: (2019)
B: Nylon-2-Nylon 6
Q.2. Regarding cross-linked or network polymers, which of the following statements is incorrect? (2018)
A: They contain covalent bonds between various linear polymer chains.
B: They are formed from bi-and tri-functional monomers.
C: Examples are bakelite and melamine.
D: They contain strong covalent bonds in their polymer chains.
Cross-linked or network polymers are usually formed from bi-functional & tri-functional monomers and contains strong covalent bond between various linear polymer chains like Melamine, Bakelite etc.
Q.3. Natural rubber has: (2016)
A: Random cis - and trans-configuration
B: All cis-configuration
C: All trans-configuration
D: Alternate cis - and trans - configuration
The repeating unit in natural rubber has the cis-configurations with chain extensions on the same side of the ethylene double bond, which is essential for elasticity. If the configuration is trans, the polymer is hard plastic.
Q.4. Biodegradable polymer which can be produced from glycine and aminocaproic acid is: (2015)
A: Nylon 6, 6
B: Nylon 2 – nylon 6
D: Buna – N
Nylon-2-nylon-6 or Nylon-2,6 is an alternating polyamide co-polymer of glycine and amino caproic acid.
Q.5. Which of the following organic compounds polymerizes to form the polyester Dacron? (2014)
A: Terephthalic acid and ethylene glycol
B: Benzoic acid and para HO − (C6H4) − OH
C: Propylene and para HO − (C6H4) − OH
D: Benzoic acid and ethanol
Q.6. Which one of the following is an example of a thermosetting polymer ? (2014)
Bakelite is a thermosetting polymer