Which is least stable in aqueous medium?
Which is least stable in aqueous medium?
A. `Fe^(2+)`
B. `Co^(2+)`
C. `Ni^(2+)`
D. `Mn^(2+)`
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Correct Answer - A
`Fe^(2+)(3d^(6))` is readily oxidised to `Fe^(3+)(3d^(5))` in aqueous solution which is more stable
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