Chemical Process
Nylon 66 is so named because the

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

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

All of these
Greater tendency of decomposition at elevated temperature
Poor oxidation stability and high gum forming tendency
Hydrolysis tendency in presence of water

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Chemical Process
DDT stands for

Diphenyl-dichloro-trichloromethane
Dichloro-diphenyl-trichloroethane
Dichloro-diphenyl-trichloromethane
Diethyl-diphenyl-trichloromethane

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