Chemical Process
Sudden temperature fluctuation does not affect pyrex glass, because of its

High melting point
Low co-efficient of expansion
Both B and C
High co-efficient of expansion

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

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

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