Question
Sea is the greatest source of some halogens. Comment.

Answer

Sea water contains chlorides, bromides, and iodides of $Na,\ K,\ Mg,$ and $Ca$.
However, it primarily contains $NaCl.$ The deposits of dried up sea beds contain sodium chloride and carnallite, $KCl.MgCl_2.6H_2O.$
Marine life also contains iodine in their systems.
For example, sea weeds contain upto $0.5%$ iodine as sodium iodide. Thus, sea is the greatest source of halogens.

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