Which of the following are basic oxides among $Mn_2O_7 (I)$,$V_2O_3 (II)$,$V_2O_5 (III)$,$CrO (IV)$,and $Cr_2O_3 (V)$?

  • A
    $I$ and $II$
  • B
    $II$ and $III$
  • C
    $III$ and $IV$
  • D
    $II$ and $IV$

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