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

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

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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

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

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