Chemical Process
Nylon 66 is so named because the

Number of carbon atoms between two nitrogen atoms are 6
Polymer was first synthesised in 1966
Average degree of polymerisation of the polymer is 1966
Number of nitrogen atoms between two carbon atoms are 6

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Chemical Process
Fluorescent dyes are added in detergents to

Act as tarnish inhibitor for metals like German silver
Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics
None of these
Attain distinctiveness from other brands

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