Chemical Process
Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it

Has larger production capacity per unit cell
All of these
Produces high purity (70%) caustic soda directly
Consumes less power per ton of Cl₂ produced

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Chemical Process
Nylon 66 is so named because the

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

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