Which ion in excess $NaOH$ does not form a soluble complex?

  • A
    $Cr^{+3}$
  • B
    $Zn^{+2}$
  • C
    $Al^{+3}$
  • D
    $Fe^{+3}$

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The $[Fe(CN)_6]^{3-}$ complex ion

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