The correct answer is (A) hydrogen gas.
Hydrogenation is a chemical process that converts unsaturated fats into saturated fats. This is done by adding hydrogen gas to the unsaturated fat, which causes the double bonds in the fat to break and form single bonds. This makes the fat more stable and less likely to go rancid.
Hydrogenation is a common industrial process that is used to produce a variety of products, including margarine, shortening, and cooking oils. However,
hydrogenation has been linked to an increased risk of heart disease, so it is important to choose products that are low in hydrogenated fats.Oxygen gas (B) is not used to convert vegetable oils into saturated fats. In fact, oxygen can actually cause vegetable oils to go rancid.
Chlorine gas (C) is a toxic gas that is not used in the food industry.
Sulfur dioxide gas (D) is a preservative that is sometimes used in food, but it is not used to convert vegetable oils into saturated fats.