Which of the folloiwng are characteristics of thermosetting polymer...

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Which of the folloiwng are characteristics of thermosetting polymers?
(i) Heavily branched cross linked polymers.
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(ii) Linear slightly branched long chain molecules.
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(iii) Become infusible on moulding so cannot be reused.
(iv) Soften on heating and harden on cooling, can be reused.
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