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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Chemical Process
Pick out the wrong statement. Iodine value of an oil or fat is

The number of grams of iodine taken up by 100 gm of oil or fat
Independent of the type of oil, whether it is drying or non-drying
A measure of its unsaturation
Helpful in findings its adulteration & its suitability for making soap

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