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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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Text Solution

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Sodium iodide on reaction with `Hgl_2` gives complex salt, `Na[HgI_4]`

Orange colour is due to presence of residual `Hgl_2`.
But on addition of excess NaI, it becomes colourless due to change of `Hgl_2` into `Na[HgI_4]`
`HgI_2+2NaI` (excess) `toNa_2[HgI_4]` (colourless)
The orange colour of `HgI_2` reappears due to conversion of `Na_2[HgI_4]` into `HgI_2` by means of `NaOCl`.
`3Na_2[HgI_4]+2NaOCl+2H_2Oto`
`3HgI_2+2NaCl+4NaOH+2NaI_3`
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