Sort out the following into group A (i.e. thermosetting plastics), group B (i.e. thermoplastics), group C (neither thermosetting nor thermoplastics).
I) Teflon II) PET              III) Polyvinyl chloride          IV) Bakelite

V) Melamine - urea resin VI) Phenol - formaldehyde resin

VII) Rubber (natural)       VIII) Polystyrene                  IX) Polypropylene

X) Rubber (Synthetic)      XI) ABS rubber

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Group A – IV, V, VI, VII; Group B – I, II, III, IX; Group C – No object

Group A – IV, V; Group B – II, III, IX; Group C – VII, X

Group A – I, IV, V, VI; Group B – II, III, VIII, IX; Group C – VII, X, XI

Group A – IV; Group B – I, III, VII; Group C – V, VI

answer is A.

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Detailed Solution

Group-A: (Thermo setting plastics)

Teflon, Melamine – urea resin, Bakelite-phenol formaldehyde resin.

Group-B: (Thermo plastics)

PET,PVC, Polystyrene (PS), PP (poly propylene)

Group-C; (Neither thermo setting nor thermo plastics).

Natural rubber, synthetic rubber, ABS rubber.

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