Out of the following metallic ions : Al^3+ , Ca^2+ , Cu^2+ , Pb^2+ and Zn^2+ ;

Out of the following metallic ions : Al^{3+ ,} Ca²⁺ , Cu²⁺ , Pb²⁺ and Zn²⁺ ; which one forms a white hydroxide which dissolves in an excess of either aqueous sodium hydroxide or ammonium hydroxide ?

Out of the following metallic ions : Al^3+ , Ca^2+ , Cu^2+ , Pb^2+ and Zn^2+ ;

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