Which of the following ions form most stable complex compound[

  • A

    $C{u^{ + 2}}$

  • B

    $N{i^{ + 2 }}$

  • C

    $F{e^{ + 2 }}$

  • D

    $M{n^{ + 2 }}$

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  • [AIIMS 2016]

Brass is an alloy of