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An aqueous solution containing one mole ...

An aqueous solution containing one mole of `HgI_2` and two moles of NaI is orange in colour. On addition of excess NaI the solution becomes colourless. The orange colour reappears on subsequent addition of NaOCl. Explain with equation.

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`HgI_(2)` is having orange / scarlet colour it dissolve in sodium iodide due to the formation of a complex .
`HgI_(2) + 2Nal rarr Na_(2)HgI_(4)`
with `NaOCI` agent a precipitate of `HgI_(2)` is formed
`3Na_(2)HgI_(4) + 2NaOCI + 2H_(2)O rarr 3HgI_(2) + 2NaI_(3) + 4NaOH + 2NaCI`
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