Which of the following statements are INCORRECT?
A) The oxidation states of chromium in $Cr{O}_4^{2-}$  and  $C{r}_2{O}_7^{2-}$ are not same
  B) The manganate and permanganate ions are tetrahedral due to the $\pi$ -bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese.
C) $Mn{O}_4^{2-}$  ion exhibits d-d transition and paramagnetism as well
D) $S{O}_2$  gas does not decolourise acidified  $KMn{O}_4$ solution