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A fresh stain...

Question

A fresh stain of iodine can be removed by using a solution of:

K I

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H_{2} S

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N a_{2} S_{2} O_{3}

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N a_{2} S_{2} O_{4}

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Solution

The correct option is C $N a_{2} S_{2} O_{3}$
$2 N a_{2} S_{2} O_{3} + I_{2} \to N a_{2} S_{4} O_{6} + 2 N a I$
$N a_{2} S_{2} O_{3}$ dissolves $I_{2}$ by oxidising it to $H I O_{3}$ .Thus it can be used to remove free stain of iodine.

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