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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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A solution containing one mole of `Hgl_(2)` and two mole of Nal is orange in colour due to the partial solubility of `Hgl_(2)`. On addition of excess of Nal, the colourless complex `Na_(2)Hgl_(4)` is formed.
`underset(("Excess"))(2Nal)+Hgl_(2)to underset("Nessler's reagent")(Na_(2)Hgl_(4))`
the `Na_(2)Hgl_(4)` on addition of `NaOCl`, oxidises as
`3Na_(2)Hgl_(4)+2NaOCl+2H_(2)O to 3Hgl_(2)+2NaCl+4NaOH+2Nal_(3)`. thus, colour of partially soluble `Hgl_(2)` is restored.
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