Which of the following metals does NOT occur in nature in a free state?
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A.
Silver
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B.
Platinum
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C.
Gold
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D.
Aluminium
Correct Answer:
D. Aluminium
Explanation:
Aluminium is a highly reactive metal that belongs to the boron group of the periodic table. Because of its strong affinity for oxygen and other elements, it is never found in its free or metallic state in nature. Instead, it occurs in the Earth's crust in the form of stable compounds, primarily as oxides and silicates within minerals like bauxite. While it is the most abundant metal in the crust, its chemical activity ensures that it remains bonded to other substances rather than existing as a pure element. Therefore, option D is the correct answer because its high reactivity prevents it from occurring naturally in a free state.
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