Iodine is used as sodium iodide in 'Iodised salt' for preventing the disease, goitre, Iodine is obtained from ?

Sea weeds

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Dry wood

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Air

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Igneous rocks

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Solution

The correct option is A Sea weeds
Laminaria contain iodine compounds which they obtain by extracting iodide ions from seawater. This iodine can be extracted from the seaweed by heating it in air to an ash, in which the iodine is present as iodide.
Hence option A is correct answer.

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