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What happens to the hypoiodous acid when the pH is over 8?

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What happens to the hypoiodous acid when the pH is over 8?

(a) HIO is stable

(b) Formation of hypoiodite ion takes place

(c) Formation of iodine and hypoiodite ion takes place

(d) Formation of iodine and iodate takes place

I got this question in an internship interview.

Query is from Iodine, Bromine and Ozone Treatment topic in chapter Properties of Disinfection of Environmental Engineering

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Right answer is (d) Formation of iodine and iodate takes place

Explanation: When pH is over 8, then HIO is unstable and will not form hypoiodite ion. The decomposition of hypoiodite ion takes place, resulting in the formation of iodine and iodate.

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