question_answer 27)

Sea is the greatest source of halogens. Comment.

Answer:

Sea water contains chlorides, bromides and iodides of sodium, potassium, magnesium and calcium. Sodium chloride is present in sea water to about 2.5% by mass. Driend up sea beds contain sodium chloride and carnallite, KCl.MgCl2.6H2O. Certain seaweeds contain upto 0.5% of iodine as sodium iodide. Thus, sea is the greatest source of halogens.