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  1. The metal that is usually extracted from sea water is

    2. A.

     Ca
    B.

     Na
    C.

     K
    D.

     Mg

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    Answer : Option D

    Explanation :

    In the US, 63% of magnesium production came from seawater and brines during 2015. The metal is extracted from seawater and brines by means of electrolysis, a process that requires the passing of a current through a molten salt.

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