To an acidic solution of an anion,a few drops of $KMnO_4$ solution are added. Which of the following,if present,will not decolourise the $KMnO_4$ solution?

  • A
    $NO_2^-$
  • B
    $S^{2-}$
  • C
    $Cl^-$
  • D
    $CO_3^{2-}$

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