Which of the following polymer has the tendency of decomposing before melting ?

Polystyrene

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PVC

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Nylon

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None of the above

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Solution

The correct option is D None of the above
Thermosetting polymers such as Bakelite have the tendency of decomposing before melting. Thermoplastic polymers (such as PVC (polyvinyl chloride), polystyrene ) on heating, becomes soft and on cooling, become hard. They can be remolded and recycled. Their properties are between elastomers and fibers.
There is no thermosetting given in the option, all are thermoplastic.
Hence, the correct option is D.

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All hydrides of group I and group II metals decompose on heating before the melting point. True or False?

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