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  4. Sodium thiosulphate is a

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Q. Sodium thiosulphate is a

UPSEEUPSEE 2008

Solution:

The presence of excess of sulphur makes sodium thiosulphate a useful reducing agent.
$2Na_{2}S_{2}O_{3} +I_{2} \to Na_{2}S_{4}O_{6} + 2NaI$
This reaction is applied in volumetric estimation of iodine. In this reaction sodium thiosulphate acts as a reducing agent