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Q)

Which of the following statements regarding sulphur trioxide is not true ?

$\begin{array}{1 1}\text{Sulphur trioxide exists in three polymorphic forms}\\\text{Sulphur trioxide is an anhydride of sulphuric acid}\\\text{Vanadium pentoxide is used as a catalyst in converting sulphur dioxide into sulphur trioxide}\\\text{Sulphur trioxide has tetrahedral geometry}\end{array}$

$SO_3$ has a plane triangular structure.