Among Fe^{2+}, Fe^{3+}, Cr^{2+} and Zn^{2+}, | vedclass

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(D) The borax bead test is used to identify transition metal ions that form coloured beads in the oxidising or reducing flame.Among the given ions, $F

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$Fe^{3+}$

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(D) The borax bead test is used to identify transition metal ions that form coloured beads in the oxidising or reducing flame.Among the given ions, $Fe^{2+}$, $Fe^{3+}$, and $Cr^{2+}$ are transition metal ions that produce coloured beads, whereas $Zn^{2+}$ forms a colourless bead and is considered to give a negative test.Ionisation enthalpy generally increases with an increase in effective nuclear charge and stability of the electronic configuration.$Fe^{3+}$ has a stable half-filled $d^5$ electronic configuration $([Ar] 3d^5)$ and a higher effective nuclear charge compared to $Fe^{2+}$ and $Cr^{2+}$, which results in the highest ionisation enthalpy among the choices provided.Therefore, the correct ion is $Fe^{3+}$.

Among $Fe^{2+}$, $Fe^{3+}$, $Cr^{2+}$ and $Zn^{2+}$, the ion that shows positive borax bead test and with highest ionisation enthalpy is:

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