Chemical Process
Flux addition during smelting of ore is done to

Accelerate reduction of ore
Remove impurities/gangue
Separate slag from metal
Enhance rate of reaction

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

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

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Chemical Process
Unsaturated oils compared to saturated oils have

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

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