Polymer Technology
Benzoyl chloride is not used as a catalyst in the manufacture of

Polyvinyl chloride-co-vinylacetate
Polystyrene
Polyvinyl acetate
Polypropylene

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Polymer Technology
Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to

Reduce its viscosity to permit easier processing
Increase its viscosity
Reduce the time of vulcanisation and quantity of vulcanising agent
Protect rubber goods from attack by oxygen & ozone present in the atmosphere

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Polymer Technology
Pick out the wrong statement regarding the solubility characteristics of high polymers.

Greater the degree of cross-linking in the polymer, lesser is its solubility
Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent
High molecul ar weight polymers on dissolving gives solution of very low viscosity
Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents

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