Assertion: Bakelite is a thermosetting polymer. Reason: On heating, polymeric chain becomes a long and straight chain.

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Assertion:- Bakelite is harder than polythene.

Reason:- Bakelite is harder because it is a cross-linked polymer.

Which of the following has cross-linked polymer chains ?

(a) bakelite (b) polyester (c) PVC (d) nylon

Which of the following are characteristics of thermosetting polymers?

(a) Heavily branched cross linked polymers

(b) Linear slightly branched long chain molecules

(d) Soften on heating and harden on cooling, can be reused

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