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Redox Reactions — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions1 Mark
Question
What happens when I2 is titrated with sodium thio sulphate (hypo) solution? Write chemical equation.
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Answer

Sodium tetrathionate and sodium iodide is formed, both are colourless.
$\text{I}_2+2\text{Na}_2\text{SO}_3\xrightarrow{ \ \ \ \ \ \ }2\text{NaI}+\text{Na}_2\text{S}_4\text{O}_6$

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