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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, but mainly sodium chloride (2.5% by mass). Dried up sea beds contain sodium chloride and carnallite, `KCl.MgCl_(2).6H_(2)O`. Certain seaweeds contain upto 0.5% of iodine as sodium iodide and chile saltpetre `(NaNO_(3))` contains upto 0.2% of sodium iodate. Thus, sea is the greatest source of halogens.
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  2. Give two examples to show the anomalous behaviour of fluorine.

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