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Among the reactions given the oxidant an...

Among the reactions given the oxidant and the reductant in each case:
`2Na_(2)S_(2)O_(3)(aq)+I_(2)(s)toNa_(2)S_(4)O_(6)(aq)_+2NaI(aq)`

Text Solution

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`Na_(2)overset(+2)S_(2)O_(3)(aq)+overset(0)I_(2)toNa_(2)overset(+2.5)S_(4)O_(6)(aq)+2Naoverset(-1)I(aq)`
The oxidationnumbet of S increases from +2to+2.5 while that of 1 decreases from 0 to -1. So ,in this reaction `Na_(2)S_(2)O_(3)`undergoes oxidation and `I_(2)`undergoes reduction .Hence it is a resox reaction in which `Na_(2)S_(2)O_(3)`acts as a reductant and `I_(2)` as an oxidant.
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