Which among the following cannot be remoulded by heating?

Bakelite

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Polythene

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Melamine

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Polyvinyl chloride

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Solution

The correct options are
A Bakelite
C Melamine
Melamine and bakelite are thermosetting plastics. Thermosetting plastics are cross-linked polymers which does not melt or bend when heated. Due to this ability, melamine is used for making floor tiles, kitchenware and fabrics which resist fire. Bakelite is used for making electrical switches, handles of various utensils, etc.

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