For the reaction in aqueous solution Zn^{2+} | vedclass

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(A) The stability of the complex $ZnX^{+}$ depends on the hard-soft acid-base $(HSAB)$ theory. $Zn^{2+}$ is a borderline acid. $F^{-}$ is a hard base,

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$F^{-}$

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(A) The stability of the complex $ZnX^{+}$ depends on the hard-soft acid-base $(HSAB)$ theory. $Zn^{2+}$ is a borderline acid. $F^{-}$ is a hard base,while $I^{-}$ is a soft base. According to $HSAB$ theory,hard acids prefer to bind with hard bases. Among the given options,$F^{-}$ is the hardest base,leading to the strongest electrostatic interaction with the $Zn^{2+}$ ion,resulting in the highest stability constant $(K_{eq})$ for the formation of $ZnF^{+}$.

For the reaction in aqueous solution $Zn^{2+} + X^{-} \rightleftharpoons ZnX^{+}$,the $K_{eq}$ is greatest when $X$ is

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