To turn liquid oils into solid fats, hydrogen is added to unsaturated fats (option A).
Hydrogenation is a type of reaction that involves the addition of hydrogen with another substance, especially with an unsaturated organic compound, and usually under the influence of temperature, pressure and catalysts.
Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, at a very high temperature.
Oils (liquid) usually contains unsaturated fatty acids while solid fats contain saturated fatty acids.
Liquid oils can be transformed into solid fats as a result of hydrogenation. In the process, hydrogen is reacted with an unsaturated fat or oil to become hardened and form a saturated fat.
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