Q. No.Regarding cross-linked or network polymers, which of the following statements is incorrect?
1. They contain covalent bonds between various linear polymer chains,
2. They are formed from bi and tri functional monomers.
3. Examples are bakelite and melamine
4. They contain strong covalent bonds in their polymer chains
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The catalyst used in the manufacture of polythene by Ziegler method is:
1. Titanium tetrachloride and triphenyl aluminium
2. Titanium tetrachloride and triethyl aluminium
3. Titanium dioxide
4. Titanium iso-propoxide
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Which of the following is wrong?
1. PMMA is called plexiglass
2. PTFE is called teflon
3. SBR is called natural rubber
4. LDPE is called low density polyethylene
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Which of the following is not a fibre?
1. Terylene
2. Nylons
3. Polyacrylonitrile
4. Polychloroprene
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The incorrect match among the following options is:
| 1. | Terylene— condensation polymer of terephthalic acid and ethylene glycol. |
| 2. | Teflon— thermally stable cross-linked polymer of phenol and formaldehyde. |
| 3. | Perspex— a homopolymer of methyl methacrylate. |
| 4. | Synthetic rubber — a copolymer of butadiene and styrene. |
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Which is/are true for elastomers?
1. These are synthetic polymers possessing elasticity
2. These possess very weak intermolecular forces of attractions between polymer chains
3. Vulcanised rubber is an example of elastomer
4. All of the above
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Rubber is heated with sulphur and the process is known as:
1. Galvanization.
2. Vulcanization.
3. Bessemerization.
4. Sulphonation.
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Which of the following is used to make non stick cookware ?
1. PVC
2. Polysterene
3. Polyethylene
4. PTFE
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