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
(5)
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