Chemical Process
The purpose of tanning in leather industry is to

Stiffen the leather
Make it flexible
Smoothen the leather
Impart water resistance

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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
Number of nitrogen atoms between two carbon atoms are 6
Polymer was first synthesised in 1966

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