Multiple choice

Which metal is extracted from sea water?

  1. Potassium

  2. Magnesium

  3. Aluminium

  4. Beryllium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnesium is the only metal among these options that is commercially extracted from seawater on a large scale. The process involves electrolysis of magnesium chloride obtained from seawater, where magnesium is present at about 1.3 g/kg. Magnesium compounds are abundant in ocean water, while potassium comes primarily from mineral deposits (sylvite), aluminium from bauxite ore, and beryllium from bertrandite and beryl minerals.

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