Which of the following statements for sodium thiosulphate is not true?

Question

$\begin{array}{1 1}\text{Sodium thiosulphate is used as an antichlor in the textile industry}\\\text{Sodium thiosulphate finds its uses in photography as a fixer}\\\text{Sodium thiosulphate acts as an oxidizing agent in its reaction with iodine}\\\text{The structure of }S_2O_3^{2-}\text{ is tetrahedral}\end{array}$