Among ${Fe}^{2 +},{Fe}^{3 +},{Cr}^{2 +}$ and ${Zn}^{2 +}$, the ion that shows positive borax bead te

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

Accepted Answer

Sol. [Key Concept: Zn$2 +$ (d$10$) gives no borax-bead colour; among the rest Fe$3 +$ has the highest ionisation enthalpy.]${Zn}^{2 +}$ does not show Borax Bead Test.Among remaining ions; ${Fe}^{3 +}$ has maximum ionization energy.

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