Which of the following does not decolourise iodine?

N a_{2} S O_{3}

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

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N a C l

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N a O H

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Solution

The correct option is C $N a C l$
$N a C l$ does not react with $I_{2}$ .

$6 N a O H + con. 3 I_{2} hot \to N a I O_{3} + 5 N a I + 3 H_{2} O$

$2 N a O H + dil. I_{2} cold \to N a O I + N a I + H_{2} O$

$N a_{2} S O_{3} + I_{2} + H_{2} O \to N a_{2} S O_{4} + 2 H I$

$2 N a_{2} S_{2} O_{3} + I_{2} \to 2 N a I + N a_{2} S_{4} O_{6}$

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