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Sea is the greatest source of some halog...

Sea is the greatest source of some halogens. Comment.

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Sea water contains chlorides, bromides and iodides of sodium, potassium, magnesium and calcium. However, it primarily contains sodium chloride (2.5% by mass). The deposits of dried up sea beds contain sodium chloride (NaCl) and carnalite `(KClxdotMgCl_(2)cdot6H_(2)O)`. Marine life like certain seaweeds contain upto 0.5% of iodine as sodium iodide, chile saltpetre `(NaNO_(3))` contains upto 0.2% sodium iodate. Thus sea is the greatest source of halogens.
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