Chemical Process
Dry ice (solidified CO₂) is used for the

Storage & shipment of frozen foods and ice-creams
None of these
Liquefaction of natural gas
Liquefaction of permanent gases

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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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