Oxidation numbers of $P$ in $PO_4^{3-}$,of $S$ in $SO_4^{2-}$ and that of $Cr$ in $Cr_2O_7^{2-}$ are respectively

  • A
    $+3, +6$ and $+5$
  • B
    $+5, +3$ and $+6$
  • C
    $-3, +6$ and $+6$
  • D
    $+5, +6$ and $+6$

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