The oxidation states of S -atoms in 
from left to right respectively are:
Text Solution
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The tetrathionate anion, 
is a sulphur oxoanion derived from the compound
tetrathionic acid, 
. Anion 
can be viewed as the product formed from reaction between lewis base, 
and lewis acid, 
Two of the sulphur atoms are present in the oxidation state of zero and two are in oxidation state +5 . The structure of 
is:
Since; each of the terminal sulphur atom is connected to two oxygen atom by a double bond and to one oxygen atom by a single bond, the oxidation state of these terminal sulphur atoms is +5 . Since; two central sulphur atoms are linked to each other by a single bond, and the sulphur is further attached to similar species on either side, the electron pair forming S-S bond remains in the centre and hence; each of the two central sulphur atoms has an oxidation state of zero. Thus; the average oxidation state of the four sulphur atom is:
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