Ammonia is a Lewis base. It forms complexes with cations. Which one of the following cations does not form complex with ammonia

  • A

    $A{g^ + }$

  • B

    $C{u^{ + 2 }}$

  • C

    $C{d^{ + 2 }}$

  • D

    $P{b^{ + 2}}$

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