Which complex is more stable [Ni(CN)4]4- or [Ni(CN)4]2- and why?

In general stability of Complexes is directly proportional to the magnitude of charge on central metal atom. Thus Complexes of Ni ⁺² are more stable than Ni⁰

^{[Ni(CN)4]4- < [Ni(CN)4]2-} 

^{FACTOR'S AFFECTING STABILITY OF COMPLEXES:}

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