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When Condensation product of hexamethylenediamine and adipic acid is heated to 553 (280 ° C) in an atmosphere of nitrogen for about 4-5 hours, the product obtained is

a. Solid polymer of nylon 66

b. liquid polymer of nylon 66

c. Gaseous polymer of nylon 66

d. Liquid polymer of nylon 6

Ans. b

(4)

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