Oxidation state of sulphur in tetrathionic acid is

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$\left[ {\begin{array}{*{20}{c}}
{\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{H - O - S - S - S - O - H} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O}
\end{array}} \right]$

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