Chemical Process
Nylon 66 is so named because the

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

ANSWER DOWNLOAD EXAMIANS APP

Chemical Process
Presence of sodium tripolyphosphate (an additive) in synthetic detergent

Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)
Does not allow redeposition of dirt on the cleaned surface
Inhibits its corrosive effects
None of these

ANSWER DOWNLOAD EXAMIANS APP