The order of basic strength of ${ClO}^{-}$ , $Cl {O_{2}}^{-}$ , $Cl {O_{3}}^{-}$ , $Cl {O_{4}}^{-}$ is

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$Cl {O_{4}}^{-} > Cl {O_{2}}^{-} > {ClO}^{-} > Cl {O_{3}}^{-}$

${ClO}^{-} > Cl {O_{2}}^{-} > Cl {O_{3}}^{-} > Cl {O_{4}}^{-}$

${ClO}^{-} > Cl {O_{4}}^{-} > Cl {O_{3}}^{-} > Cl {O_{2}}^{-}$

$Cl {O_{4}}^{-} > Cl {O_{3}}^{-} > Cl {O_{2}}^{-} > {ClO}^{-}$

answer is C.

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Detailed Solution

If the acid is strong its conjugate base is weak. Same like if the base is strong its conjugate acid is weak. Among the given option $Cl {O_{4}}^{-}$ is the conjugate base of strong acid ${HClO}_{4}$ , therefore basic strength of $Cl {O_{4}}^{-}$ is weak. Among the given option ${ClO}^{-}$ is the conjugate base of weak acid $HClO$ , therefore basic strength of ${ClO}^{-}$ is strong.