Chemistry - Ionic Equilibrium Question with Solution | TestHub

(A) Pb²⁺, Al³⁺, Zn²⁺ are amphoteric → dissolve in excess NaOH forming complexes like $[M(OH{)}_4{]}^{n-}$

(B) Cu²⁺, Cr³⁺, Zn²⁺ form stable ammine complexes with excess NH₃

(C) Pb²⁺, Hg²⁺, Bi³⁺ form soluble iodo complexes in excess KI

(D) Cu²⁺, Fe²⁺, Zn²⁺ form coordination complexes with $[Fe(CN{)}_6{]}^{4-}$