Which of the following ions form most stable | vedclass

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Question

(a)The magnitude of stability constants for some divalent metal ions of the first transition series with oxygen or nitrogen donar ligands increases in

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$C{u^{ + 2}}$

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(a)The magnitude of stability constants for some divalent metal ions of the first transition series with oxygen or nitrogen donar ligands increases in the order.

$M{n^{2 + }} < F{e^{2 + }} < C{o^{2 + }} < N{i^{2 + }} < C{u^{2 + }} < Z{n^{2 + }}$

Which of the following ions form most stable complex compound[

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