Which of the following metals is extracted from sea water?
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Potassium
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Magnesium
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Aluminium
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Beryllium
B
Correct answer
Explanation
Magnesium is commercially extracted from seawater through the Dow process. Seawater contains magnesium salts (mainly magnesium chloride) which can be precipitated and processed to obtain magnesium metal. The other metals listed are not obtained from seawater.