Chemical Process
Unsaturated oils compared to saturated oils have

Higher melting point & higher reactivity to oxygen
Lower melting point & higher reactivity to oxygen
Higher melting point & lower reactivity to oxygen
Lower melting point & lower reactivity to oxygen

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Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Have affinity to retain harmful sulphur compounds
Always contain some amount of nickel (as their complete removal is very difficult)
Are prone to rancid oxidation
Cause cholesterol build up and blood clotting

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