Chemical Process
DDT should not be allowed to come in contact with iron (during its manufacture) to

Avoid its decomposition
Achieve non-hygroscopic property
None of these
Prevent sulphonation of the monochlorobenzene by the acid catalyst

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

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