Question

Which one of the following ions forms most stable complex compound?

• A. $Cu^{2+}$
• B. $Ni^{2+}$
• C. $Fe^{2+}$
• D. $Mn^{2+}$

Answer 1

Answer: (D)

$Mn^{2+}$

Answer 2

$Mn^{2+}$ will have half-filled more stable $d^5$ configuration and without disturbing it an outer spin complex can be formed.