The number of correct statements among the following is

1) Both  ${\text{MnO}}_4^{-}$  and  ${\text{MnO}}_4^{-2}$  are having tetrahedral structure
2) Purple ${\text{MnO}}_4^{2-}$   is paramagnetic and green $Mn{O}_4^{-}$  is diamagnetic 
3)  $Mn{O}_4^{-2}$ Exhibit color due to d-d transitions  
4) $Mn{O}_4^{-}$  Oxidizes $I^{-}$   to  $I{O}_3^{-}$  in alkaline medium  
5) Number of moles of  ${\text{K}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$  reduced by 1 mole of  ${\text{Sn}}^{\text{2}+}$  is 1/3