Final answer:
The metal in question is magnesium (Mg), which is used to make Mag Wheels and is the active ingredient in the milk of magnesia as magnesium hydroxide. The option (A) is correct.
Step-by-step explanation:
The reactive silver-white metal mentioned in the student's question, which is used in an alloy to make Mag Wheels and has a compound present in the milk of magnesia, is magnesium (Mg). Magnesium alloys are indeed used in the production of lightweight wheels for performance vehicles, commonly referred to as Mag Wheels. Additionally, magnesium hydroxide, Mg(OH)2, is the active ingredient found in Milk of Magnesia, which is used as an antacid and laxative.
Magnesium is also known for its application in the production of lightweight alloys, which are used in a wide range of industries, including aerospace. The usage of magnesium is facilitated by its properties, such as being malleable and ductile at high temperatures, and a passivation process that decreases its reactivity when exposed to air. Therefore, option (A) is correct.