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Question

Which of the following can be repeatedly soften on heating?
(i) Polystyrene

(ii) Melamine
(iii) Polyesters
(iv) Polyethylene
(v) Neoprene

A
(i) and (ii)
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B
(i) and (iv)
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C
(iii) , (iv) and (v)
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D
(ii) and (iv)
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