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The concentration difference is key here. 9 M acid is much, much stronger than 1 M. In 1 M HCl Iodate is more likely to interact with water than with HCl - water molecules have fewer electrons than Iodate - it makes sense that Iodate loses electrons in 1 M acid (remember oxidation is loss). In 9 M HCl Iodate is more likely to interact with chloride ions which would force electron density on to the iodate molecule, thereby reducing it. However - it is still somewhat up for debate what the real reasoning is. Science is the process of using the evidence to judge what is going on, and this is an on-going process. Read more here: https://phys.org/news/2011-11-iodate-intimidate.amp
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