Chemical Process
Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of

Nitric acid
Hydrochloric acid
Formic acid
Methyl alcohol

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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

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

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